Malicious PDF — malware analysis report

Static analysis result for SHA-256 54371b9242f6a5c5…

MALICIOUS

PDF

73.0 KB Created: 2021-09-18 20:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa81a5d5fc2a633fcc2ffa9de9310232 SHA-1: b5a4e45562c976f8722ef2413e93de68b6b553d5 SHA-256: 54371b9242f6a5c541fc05324277326db65552bc1a10af5df601120a2c1ce209
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://salamatekhanevadeh.ir/ckeditor/files/files/74519166369.pdf In PDF document text
    • http://mikomisushi.com/uploads/files/76513206057.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613124293f61e---fidofowevupugixem.pdfIn PDF document text
    • http://gojjang.com/uploads/files/39970361080.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138caa28163e---ninon.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161389b5edc678---vosesozonozaxunanaratavaj.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/dezisi.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/73148902430.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzumipavozupojoludusizob.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109162157175311.pdfIn PDF document text
    • http://banquat.com/userfiles/files/14926727682.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/1c79143a25462ddda083630458037cf8/54509749614.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/12859099929.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210913171510.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/xakamewadenabumisarav.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/tedexuvepikopanipafeje.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/mopuxasuzudilumoxefejo.pdfIn PDF document text
    • https://totalsewa.com/userfiles/file/gizilawenaden.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/favopofipasiketumiv.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/50299776737.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/26f027oqk4d6v6v8hb7ba5cirv/92863248493.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/nebuputinotosodukidebazus.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///97448736926.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410787b8e7c---bulagizo.pdfIn PDF document text
    • https://huangs.tw/uploads/files/202109050644177284.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/batogiwoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+mp+chartPDF 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_off0000bbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEE 16868 bytes
SHA-256: d61cffa0ce87f585c931bf6326cb9eba2a447c5f27f3f51c89244cd0304d421a
font_01_sfnt_off0000e731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 10416 bytes
SHA-256: 1b02921dbce358178490297da36835906ff70da3e28fc1b658a1a01baf3296cf