PDF malware analysis — malicious · 5a6d7aada235782b

MALICIOUS

PDF

91.1 KB Created: 2021-06-28 23:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 53ab1094604d80328e045ead9f8510be SHA-1: 4bf7d64dce107c358a3525494cf5fab483ac2f0b SHA-256: 5a6d7aada235782bcd113469a4d91a7b1125730136c210dbb3e3e6e718efbf04

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to trick the user into downloading a malicious payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9822

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5c1bd7f28---78619467740.pdf In PDF document text
- http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd63251c1f---49768000858.pdfIn PDF document text
- https://propertiproperty.com/Uploads/userfiles/files/sipasesisesisolilelu.pdfIn PDF document text
- https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/d4081f3183a291ec829d5f093f6ff92f/42591385404.pdfIn PDF document text
- http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/fd41c98e76167d90755dd8e684a24c27/42267530847.pdfIn PDF document text
- http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160873e53022ca---7431466222.pdfIn PDF document text
- http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090d465d3449---rerugi.pdfIn PDF document text
- http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dca98b7f0---54720746871.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rjsp858vft4b7517ck4l8t71p6/sotefuren.pdfIn PDF document text
- http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7997a930d---46347840118.pdfIn PDF document text
- http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/co6rftgq3tq7rqju4bmgef3sk7/pajogapujixotipe.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/4vrqjs1jqjr9rdu4sotvfcr8s0/wamiremevosujivaxuzak.pdfIn PDF document text
- http://xn--b1akwe.xn--p1ai/userfiles/file/41873314903.pdfIn PDF document text
- https://alajuusa.eemedia/contents/file/xilobujifabu.pdfIn PDF document text
- http://mytmbc.org/fckimage/file/wavipazuvodevep.pdfIn PDF document text
- http://jmdfhjl.com/fckeditor/userimages/file/fusepazu.pdfIn PDF document text
- https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/c4f93cdd1e89880bc5801868b9f8ec93/nugefotigekakigorekipe.pdfIn PDF document text
- https://digireg.se/upload/82229940470.pdfIn PDF document text
- https://arerp.kr/data/file///bumilikagamagonuwufaz.pdfIn PDF document text
- http://blissrenewbeauty.com/newerac2c/userfiles/file/waxob.pdfIn PDF document text
- http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c89f424e200---55492083562.pdfIn PDF document text
- https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/p3v63a2c4u1ju2cd8388s9ndak/gibunujabeborumok.pdfIn PDF document text
- https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/4ccba16f474fc3135d457a9066bbede0/59918954874.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160956a2d373ff---sudezomatotoxipofis.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606febf927b4d---49758498798.pdfIn PDF document text
- https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2bdf7dab4d7f94709301e2cbec1cfb98/48965085999.pdfIn PDF document text
- http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0c19a2cdd---16617975285.pdfIn PDF document text
- http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160719c1e69c9b---zemusabobuzivobonepev.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=god+made+the+world+in+7+daysPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fce4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE4	10804 bytes
SHA-256: `bafab93bbed44f22419fb591e5f5143ecc4e806440cf02dbdccc939433436e7a`
`font_01_sfnt_off000115b9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115B9	18224 bytes
SHA-256: `317d3c19550d66ac8b987bfe88af4dfa6ab7321eedf0a57c8ca0bb17e7c7b90c`
`font_02_sfnt_off00014551.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14551	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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