PDF malware analysis — malicious · 831e187c8ac6b78e

MALICIOUS

PDF

91.9 KB Created: 2021-08-02 15:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 3fbb769ba4a603b8eabf69f182d134e9 SHA-1: 144ffe8fde367f3d332e274cc48f444e119d5c62 SHA-256: 831e187c8ac6b78eea2c97cdfa6d7ceaf86d5639d8ac162b0769076a750fc7d9

176 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document prompts the user to call a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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 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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/14c080f398f7f6184f2cb0377ae19c81/mikamozagibonogomoxow.pdf In PDF document text
- http://amongelite.com/ci/userfiles/files/56258478570.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/849f09930d4327bd24d6e75e8853c761/59735308545.pdfIn PDF document text
- https://jairdefreitas.com/ckfinder/userfiles/files/sinifufot.pdfIn PDF document text
- http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e2874ad79---buganedizix.pdfIn PDF document text
- http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607669bedfaf1---13740861645.pdfIn PDF document text
- https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae02b3b5e98---87328511045.pdfIn PDF document text
- http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e23fca35f---49033224720.pdfIn PDF document text
- http://realfootball.gr/userfiles/file/nuwumebisijotefetasegaj.pdfIn PDF document text
- https://panificioilcavaliere.it/userfiles/files/40928454369.pdfIn PDF document text
- https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/jmbe8c1fbfa3vrbcml873f6tco/34451727369.pdfIn PDF document text
- http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d66a69cd074---98976495157.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a173a3849f2---43086988773.pdfIn PDF document text
- https://suma.ca/upload/editor/file/29999868916.pdfIn PDF document text
- https://lemanssrl.it/file/10458270461.pdfIn PDF document text
- https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/9i2g802ihk7ba4qst7b0act0i3/55736935228.pdfIn PDF document text
- http://e-skala.pl/userfiles/file/61566718862.pdfIn PDF document text
- http://msinziniering.com/userfiles/file/93554672875.pdfIn PDF document text
- http://eviljoy.com/UserFiles/File/witejosifufojajuxewape.pdfIn PDF document text
- https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a847c4f8d---83381086136.pdfIn PDF document text
- https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/8f3cb626fdb1702b93797dd5fe4d20b9/12478354261.pdfIn PDF document text
- https://drinkpoint.com/uploads/files/tanebatojilanezepuguf.pdfIn PDF document text
- http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743d1b75765---36300421380.pdfIn PDF document text
- http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e347de7df---gigilelodebedix.pdfIn PDF document text
- https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c4db5275b---63669553687.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b73d4a1a4---pibofejidupagufigazezax.pdfIn PDF document text
- http://hillhouseclassof1961.com/clients/c/c9/c9b049383fb65e98d0a4dcab6c176392/File/sidogukeporijuzozoxejuvap.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=dc+unlocker+free+username+and+password+with+credits+2020PDF 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_off0000ff9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFF9D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off000117af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117AF	17812 bytes
SHA-256: `0afe502bf4891b2e0c6632daed96e1b0710b8da17c2c15746ad4f26a9af15f0f`
`font_02_sfnt_off000145f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x145F5	11404 bytes
SHA-256: `22f20dc5cbcde429fef959eb6b0e0c6d600fee12465b383d1aa6e235a3758a74`

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