PDF malware analysis — malicious · fa1dcd463fd9beb4

MALICIOUS

PDF

86.7 KB Created: 2021-07-06 15:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: a304d16c52a56c2be6398a2cd66d07e3 SHA-1: 264ce130800ec531d816cd41e9e11506b9061eb7 SHA-256: fa1dcd463fd9beb49aa9e06a6efc011e59646a83ec8c2f9a0a126843a038243c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of external URIs and a link farm points towards an attempt to lure users to malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9848

Heuristics 6

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.
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://kstarsmall.net/userfiles/file///64694203499.pdf In PDF document text
- https://lavaecucebrescia.it/file/durumomoz.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d33ea510ba31737fd1fb33e47a60b0a7/zurumomubo.pdfIn PDF document text
- https://cuisinescartier.ca/upload/editor/file/96161084604.pdfIn PDF document text
- https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/hurc4pu2oql2airqtqdjve0ito/26267391457.pdfIn PDF document text
- https://fishboat.hr/files/82340580757.pdfIn PDF document text
- https://acronimocostanzo.com/userfiles/file/wiwopojiwekubazed.pdfIn PDF document text
- http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088008e3283d---26678989921.pdfIn PDF document text
- http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bead7143---tesenamekifow.pdfIn PDF document text
- https://africanresearchcenter.com/userfiles/file/depumesodidorexa.pdfIn PDF document text
- http://capitaloffice.pl/fotki/file/kosavavanifajimolis.pdfIn PDF document text
- https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082c21db6f90---mefukanokugar.pdfIn PDF document text
- http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6001975df---zosanojagepirudevulum.pdfIn PDF document text
- https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/47a5012e4b99836b7a3fb08ec73ba6cd/mosig.pdfIn PDF document text
- https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4a29ed8e27478f1bb42661477a14d2f3/mamiranututevujike.pdfIn PDF document text
- http://tencanpowder.com/d/files/83828224021.pdfIn PDF document text
- http://tamphuhiep.com/Images_upload/files/93101838777.pdfIn PDF document text
- http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607581cf9255d---vovewi.pdfIn PDF document text
- https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/pnv11nrqghv30lha2jmfmccja3/50273968397.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160705a9e0f0ba---zigogesu.pdfIn PDF document text
- https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/9f1c91897910182ddc778309c9930267/pugolojetu.pdfIn PDF document text
- https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0e033915e26ac29239fc694fe7b91068/gonepugigojavilijuxif.pdfIn PDF document text
- http://hnysft.com/d/files/27292299997.pdfIn PDF document text
- http://momsystem.ru/public/file/zipasaj.pdfIn PDF document text
- https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7b765c1659f51ee7af0b557903833c8f/terutazoxabebanatadisogax.pdfIn PDF document text
- http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080a5af871d6---mimosaneweruda.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cic+lmia+processing+timePDF 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_off0000f110.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF110	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00010927.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10927	10748 bytes
SHA-256: `aa1711d79954e907887155a82785f995f836218cf6fe7fb22132db5a84a7e44a`
`font_02_sfnt_off000121db.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121DB	16776 bytes
SHA-256: `5297011a1972a660aab5be359ca499155cd52a10bb1981c9a425e6bd24d12c79`

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