Malicious PDF — malware analysis report

Static analysis result for SHA-256 e567b99690de84e2…

MALICIOUS

PDF

175.9 KB Created: 2021-07-16 13:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: bd957bdd7c5fe81959f294c22691607f SHA-1: 72fe89eaaca9b0eed49689ff8a400102a4904612 SHA-256: e567b99690de84e21b7c4aedd75d12ddd096247d0271876def43574e9c5a2c0f
204 Risk Score

Malware Insights

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

This PDF document impersonates Facebook to lure users into clicking a link that leads to a credential phishing page. The ML classifier and ClamAV detection strongly indicate malicious intent. The document leverages multiple compromised WordPress sites and disposable hosting for its malicious links, suggesting a phishing campaign designed to harvest user credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://smidgel.ru/uplcv?utm_term=bloons+td+2+unblocked.
  • 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
  • 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://smidgel.ru/uplcv?utm_term=bloons+td+2+unblocked PDF link annotation
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a6ed6e764d62e622ea8bd978efebfdbf/wunedumofajakunor.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092742373335---83579393885.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623932743.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/88103557244.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/42358450750.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4b2b594f4---bujegikijifoxu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c9daecf8---xamenutilafedorisijosito.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/nibagowixatozuvaxu.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/tipenamemimizifosa.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v7vplilbuu8pugcf49uju2ja56/bevivuwotefaxam.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a91565fe7c---rilidefopur.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/91af6f827c037fbd618b637fea03b8d3/sakigawagebodixesupul.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0a8e3309a---84328999079.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e314dab8e2d---39549054494.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/pekofitoja.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8898b45304804b32de35390b05fe33ac/44619639322.pdfIn PDF document text
    • https://sambelteri.com/contents//files/xetadafiwowibame.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c176607847---mevosapu.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7e624990d7d4779bbf23c38104c51b71/58555169064.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a154979a0d3---vurolanopuzos.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edea57334c3---39217048755.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/nulezo.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a35432b---37338584067.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_off0002512d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2512D 18488 bytes
SHA-256: d256e6a9b2a74c233d22f6df257861f081ba125743813915bdcca8e00d898ed8
font_01_sfnt_off000281f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x281F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00029a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29A08 10512 bytes
SHA-256: e6c6b3f752ee8dcb5aac2bee97f0611f2dce566eeb1ad8298553a0af5e39f85e

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