Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4a642271bea8cb…

MALICIOUS

PDF

85.2 KB Created: 2021-07-23 07:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: acdd95def3e39027bf1efbf8128e3c39 SHA-1: 9b4f75374b472284f6335096df635c65d94389c3 SHA-256: bf4a642271bea8cbe8ecfca0bba58c139593da9d301b19e132efb8f088f08821
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing. The document body is heavily obfuscated and unreadable, providing no direct textual clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ed0cee7a3d2---5972960986.pdf In PDF document text
    • http://barcabianca.eu/upload/file/xelovogafarulemin.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/4e2232b78a5893fbc55943883db67f07/veloxiropoporakogoragiw.pdfIn PDF document text
    • https://emmaushuis.org/pages/57377792740.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/disor.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/dalitadumegunexegipa.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b90bbc7dcf---pojetewipesudadij.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/bizuwenutemukigot.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/urmp48bm1boebod40j2pbda4u8/5038276599.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/jolituwij.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/3d8da99c912168b6300eda71afca4f56/zodufinuzudakot.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105010907433481.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/44026262238.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/0lfppj4rtq27p76lc3h2vd2pf9/17429184563.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/278308161.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/defigivuguziru.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/373839e1adbb45311535e6f4e7ebc802/6520687055.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/lavis.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/32772630654.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/qpagthabudmuf8n5p6f29upnib/76833139256.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/2393310630.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607040ff49e0a---xogetezirivi.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fc4b28fc9---guwuvadebuwokesevulim.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/13992402664.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/30551648376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=sample+letter+of+delivery+confirmationPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 16084 bytes
SHA-256: 655c7242afff750ec8709c4a6a6cc7b5a110a7a74ec076a87069aef88589ba11
font_01_sfnt_off000115a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A9 10868 bytes
SHA-256: 05ba5da4678e0be719aebeb122a8e4e66c4ab25fc4632ba2a99f9bb12e9a4527
font_02_sfnt_off00012ec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1