Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43a4a4ecb1cd788…

MALICIOUS

PDF

84.2 KB Created: 2021-09-14 06:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f31326a105b071d9e64bfe4a8c4130e9 SHA-1: 07d50016ab17bb7cc0854d072242213de6e776b4 SHA-256: b43a4a4ecb1cd788dd05f46c620abc8a58b7cc32a57eacbcc92c0c977e533ae9
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_URGENCY_LURE' and 'SE_DOWNLOAD_BUTTON' suggest the document attempts to trick users into clicking these links by creating a false sense of urgency or by presenting a deceptive download prompt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=boss+planner+android PDF link annotation
    • https://takipbizde.com/calisma2/files/uploads/nifemo.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/jegiwipujezejexududajuda.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/916253590.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/dazagino.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kotitedukov.pdfIn PDF document text
    • https://menu2uplus.com/images/file/rogofitebi.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/22531188865.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/famajuluvawudinokawotog.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/48441621765.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/74323822357.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/66772562852.pdfIn PDF document text
    • https://umutfm.com/resimler/files/42288824900.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161312e7eb8197---2445647450.pdfIn PDF document text
    • http://kite-surf.sk/files/ravabazebiratema.pdfIn PDF document text
    • http://pm-ural.com/uploads/files/36311440300.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/45624021640.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/betugavuxobapogatok.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b70f2d3c6---dibegofetekenuzikeve.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/992da28a50c74811df9f28b121a1cb91/75134825492.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/zitadurixumiviwadi.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/56731889206.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/dexon.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/duwutuna.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/begikomewomexaxoniwokuv.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f81d9ee02---vuvirur.pdfIn PDF document text
    • 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_off0000e396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE396 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 10340 bytes
SHA-256: 62b5ea1075f2944eaa0437d73938b82cba13d47b9414cc727ba7e796cdb64a56
font_02_sfnt_off00011315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11315 18376 bytes
SHA-256: 73d55da9555b4059d0b8ecf6559e5884f9d6a44fefdc515d0846ab594e8f8bbd

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