Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1a9818319b6992…

MALICIOUS

PDF

92.0 KB Created: 2021-08-03 05:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29fb8acbe83b39647aab150dc3aa1444 SHA-1: 6f900266bd62be5f0f797ce4d51bb232aed97b33 SHA-256: cc1a9818319b6992fc74570b09ff7a3bb23cdaaadf7156ee32e3c3334f18ddc2
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 7

  • 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.
  • 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://bakwanudang.com/contents//files/geratasugiduxasuromipu.pdf In PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/00604c02818b48ef208851619217ba19/55393175937.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/4c0067ad388004c692e66f7aac597695/7929740362.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/sejagotikut.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607bca059b0f0---34170381187.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/padinafok.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/8051b854e38e35c09f7e58335e8dae72/74906101194.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/82320245152.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/c1c56f5a52c0a495bc052111c8575d34/82210466642.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c15f4d4567---63026332132.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/aeb0674dfaa142f999feccdddb13891b/53792097641.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/wasudus.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2e69b6111732371bd0ac4b78834eab03/lipitipobuxexo.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/nasigamabosorotitafekuga.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/tbvndn5eaqflcu3sdiinqqtshs/fojutubuvetinadonafip.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bfad721aeb552b6d1efc8034b0b8f7b7/tolibuvurirujasi.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/53357804641.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r463rkg15hqeuttiko2uclfab6/widivoselivo.pdfIn PDF document text
    • http://hkacca.com/userfiles/76947505798.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/41ce22115c2def56a01bc851da1270af/89238057423.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/o5mdmmggsqfu7baft9egtk2f91/1309616130.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/96797092643.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/96cdda3bc7b673248562f10ccafc0e0b/mabezumilepivavidosaxaj.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f93842294---kedoguvowigisebipobere.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/99353170627.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/fabumaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bloody+roar+3+download+for+pc+ocean+of+gamesPDF 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_off00010271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 11196 bytes
SHA-256: 379b8c1c00b44b18a1bec366df8832f37e39748eedeebcaf6a35005f6f90e2a9
font_02_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 17048 bytes
SHA-256: dfb63132ac421b11839f5242ca275e36ea81cabc16984852818d00a1c0d7aa57

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