Malicious PDF — malware analysis report

Static analysis result for SHA-256 51624039127252ec…

MALICIOUS

PDF

112.5 KB Created: 2021-06-25 23:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 266d15335b693c377ea81f444ffd83c0 SHA-1: e9819c25955bc70fc678b5412ed214aa0f359a6d SHA-256: 51624039127252ecc4242a07b5fa0ff3f4299390ba0b20aec9465c78189999a4
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 CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9780

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://jaika.in/images/documents/files/weremavuf.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdecacdea1---41407231401.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/gdrhn8afq9979fog2r7l8n7ci1/82840491731.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80ba832aa0---xomilolig.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea65eca83d---59588057783.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab72f39ba2---zemumegani.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839816c0ad9---nujanapoporaro.pdf
    • https://firsatpin.com/calisma2/files/uploads/37647944267.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2a4a72657d---89136702921.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1e6b1ba88---96239510472.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0dc79f856---gofewewe.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870ca592510---91769057181.pdf
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772abd8740---21307645043.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/5ga96okoevvas9c5tkr5pjchk6/49368082408.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160872dbdb9290---ferekukemido.pdf
    • http://mobiliteit.nu/files/15641489217.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///20210619215716_786682298.pdf
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae943c2eabe---3391667156.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607babd6a24fa---28970439990.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/19cshrclgmnm4as99k6f7a98fj/kadibetupogurobitedexez.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2ab5f117b1e7c9a332322300f492fb36/71593064820.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9c6adea686eeb94de5a2923293c21603/xuluvafowezojawof.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf84921f5e---71611948845.pdf
    • http://reicar.dk/userfiles/file/pajixejazosamalidigigep.pdf
    • http://divorce-difficile.fr/userfiles/file/66580944754.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f343e5be---62073390076.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/de4b5ec0fdc7ea8713b2cd6b6dcd5767/69230642964.pdf
    • https://akita-inu.lv/www/files/files/6099198601.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=aunt+and+niece+relationship
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000153f1.bin
1eea471340fb3cb982bef75317173934dc7144a6d8a6f63a225279b3ec266fdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x153F1 18040 bytes
font_01_sfnt_off000183a0.bin
286eb9ca81b82b88e7435e47feeeccbe7dc0d097ee8d2d0c46767603382119f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x183A0 10692 bytes
font_02_sfnt_off00019c15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19C15 16792 bytes

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