Malicious PDF — malware analysis report

Static analysis result for SHA-256 f913c173165c9815…

MALICIOUS

PDF

88.3 KB Created: 2021-06-09 23:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c48395c8adb13672d940d4045dea841 SHA-1: 08d75c9727e57bf60833ade1d0676dc2f5bf411f SHA-256: f913c173165c9815e508bb5bb4ff139195f71b5f2b7343caec41a64a0fa34c75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs points to a tactic of leveraging potentially malicious or deceptive external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://allytemp.ru/uplcv?utm_term=valuable+comparative+and+superlative
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e30bc1f39e---37745527338.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/iscfl2a65svusl4ms0ovoucedp/67726250533.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b69283dc204---nonojujetevalererelowav.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/s0jlll0aaok8pleflhf5i6m7t6/mamakofevesorovupej.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab09cf03fe---pukeruwovunem.pdf
    • http://www.chatanakonci.cz/userfiles/file/tuwijariditirerat.pdf
    • http://doo-san.com/userfiles/file/20210529171205.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/4206983719.pdf
    • https://brianhigbielaw.com/UserFiles/file/fimibe.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/7d2e65092685780475c97c1150af3fd4/wuzudepufamatijelonaride.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d73f8908686cefcc13014b2b3b511619/defotoz.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/6ssvsgkq78qekjdnj3euu059s2/najinobaveda.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b49887a1155---jarapomiwelofane.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ae74b4cac76fe0267ba2accb1103c71c/79665866972.pdf
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/daxofimebotazetosu.pdf
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/vf0ek09lg9ns81bkn8is80m7rd/tibujotugalezuwif.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/4483bdc546b366f3da294bd2416a0201/zolorifazelijozazekob.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ede.bin
39d8e7ea316851f9fc521632916c5ac0d73ded8fd8d2eb6628d748edef4ffce7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 5264 bytes
font_01_sfnt_off000120a3.bin
e70c851aa698c43f3fe8ca4795e741012a04f16c121fc5a58c20ddb977c2e2c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 10880 bytes
font_02_sfnt_off000145a0.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x145A0 4324 bytes