Malicious PDF — malware analysis report

Static analysis result for SHA-256 888c2c4fb6e876c5…

MALICIOUS

PDF

105.9 KB Created: 2021-08-01 15:17:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 266d1e0afd83c2b831483415123d12e6 SHA-1: 2a4981cf47f40cc573f1efb0596dd614c7a79999 SHA-256: 888c2c4fb6e876c5f5e21ad4c90e2d9e2b2fa7d5df7fc976321639f5b57bdd91
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a browser extension installation lure. While no scripts were directly extracted, the embedded URLs suggest a phishing or malware distribution attempt. The document's structure and numerous links point towards a social engineering tactic to deceive users into downloading malicious content or providing credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://inlygiaylynhua.com/upload/files/xavixukumib.pdf In PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4126b5a0d---gilokejufudomipusurefi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16100e3712e73b---wedidupelemazano.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d293b32aa---gixuruwetuvazodekevoduje.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/ae0ee1cb7da996584ddbe439eeb1c629/24588591423.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a2d2cd03e---javesulevurakomo.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/78040253030.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/4487559808.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/ninifavotofunomedoma.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e33da53f015---fupotonoxomunazuxi.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/60a449ce923ff3eadced80fef80efc52/kalugomejasijagem.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671d4e7205---80029240548.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e09cbdaa5---nofadowikuju.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9e36f1ea6---8448647238.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/14916258584.pdfIn PDF document text
    • http://lg-palette.com/upload/files/19116593705.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae00ef6b5d5---24341089986.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/wigazazodune.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607afb72a38b1---29020291157.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/benadusaxizinari.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/jisidakuzenidujozob.pdfIn PDF document text
    • https://faceless.me/userfiles/files/52956723410.pdfIn PDF document text
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/94084124456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+many+questions+are+on+the+padi+final+examPDF 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_off00013652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13652 17728 bytes
SHA-256: 38d9056d233ee4ae26f8aa0c83f3d7bb4c4553ab2c7749872bba036b24f030c9
font_01_sfnt_off000164cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164CD 11304 bytes
SHA-256: dd5d6bd67831c8bb431053935ee131478eb24fb215f5906c45106a8633d128bc
font_02_sfnt_off00017eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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