PDF malware analysis — malicious · 79798d2958bfa309

MALICIOUS

PDF

82.0 KB Created: 2021-07-19 16:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 11049089ef318ed6fe34cde48b5e7727 SHA-1: f6e970dd214294bbfe5467daa7a897103f346348 SHA-256: 79798d2958bfa309216047372f08a5f11f3059c1262ef91dfb799790cd0bc454

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was detected as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The heuristic 'SE_INVOICE_LURE' suggests the document's content is designed to trick users into downloading it under the guise of an invoice or payment request. The numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting further support its role as a distribution point for malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9833

Heuristics 7

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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.
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://jar-ted.pl/file/fudeju.pdf In PDF document text
- https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/5e9bbc4c382b3c2fb96b638944d63f2f/74823465071.pdfIn PDF document text
- http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607a146d8bfba---vogejixibinilapuk.pdfIn PDF document text
- https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0115e62b4154a4f7bcc0c4fc0f9493d2/66195335406.pdfIn PDF document text
- http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kasekovoge.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b89b94333---89437078309.pdfIn PDF document text
- https://wfca-czech.cz/temp/userfiles/files/88895837191.pdfIn PDF document text
- https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/4bc908243eca4bc44f91258fcf421e06/xanatirujowafinafawaw.pdfIn PDF document text
- http://shortguycentral.com/ck_uploads/files/tokopen.pdfIn PDF document text
- https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0c0e16ca6---57138186865.pdfIn PDF document text
- http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075070a628b2---nuvuzujulefu.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1fqdilgm3ro2ieoi8f84aso492/84902853575.pdfIn PDF document text
- http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9980b9916d---rusokarudi.pdfIn PDF document text
- https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0475cc080dea130c0466402d561264e7/mopatipawalesofamivokuwaj.pdfIn PDF document text
- https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/1fc85cbc228dc6e5cf6f110d5f0a3026/bikumo.pdfIn PDF document text
- http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da0d4ca81b3---17967092435.pdfIn PDF document text
- https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/1e553f55eb8b65846fe1d2be9390fe5e/mivokol.pdfIn PDF document text
- https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086ea8723b74---jevaxanakelug.pdfIn PDF document text
- https://aronabritcan.com/userfiles/file/87410987443.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf43a42532---miwetoworovawubeg.pdfIn PDF document text
- http://alliusie.com/userfiles/file/69625357927.pdfIn PDF document text
- https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/8d33a4854439c2ccd1eb40d95923d895/barusivedamovem.pdfIn PDF document text
- https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47162afadf---dijen.pdfIn PDF document text
- https://isosklo.cz/uploads/29556703293.pdfIn PDF document text
- http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160aa945347ca2---88609152672.pdfIn PDF document text
- http://hum-lucknow.org/test/fckeditor/file/besasumavabezenimosiv.pdfIn PDF document text
- https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/24f1abe5dfcce71e951758a60fad61fd/sapagesug.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=peppa+polly+parrotPDF 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_off0000de82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE82	17356 bytes
SHA-256: `b9fa493a5f831b4d9a7bdb6f469202039cb3a9ef0efa9102f0cf4d1375ec9f1c`
`font_01_sfnt_off00010c45.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C45	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off0001245b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1245B	9996 bytes
SHA-256: `9c9ee57b862b9020756a1c73f4e5bbd30b36a71dfab41292295c73689d6bd9d5`

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