Malicious PDF — malware analysis report

Static analysis result for SHA-256 b987b4d2aa72df2d…

MALICIOUS

PDF

68.2 KB Created: 2021-09-06 12:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa89a53dfcf3afd6b71ffb3b8f32b5bb SHA-1: e0a6c2d420def74a44648d08574c9395747a42d6 SHA-256: b987b4d2aa72df2d0c3598c1317812d16f95cc4c8995ee9ca0c29175da6c52de
224 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The document's structure and content indicate it's designed to deceive users into clicking through to a secondary malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.velkoobchod-man.eu/ckfinder/userfiles/files/fubakurakofojuweruwose.pdf In PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vudefunuzemegalemiwu.pdfIn PDF document text
    • http://contextuae.com/resimler/files/vemuwefa.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/911673327fc678a89187d5d7f2aaeb90/sosugavabav.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c4b7a65b---87214911567.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/75692990452.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313e442551d---44965627149.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/23578134920.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/f6209c15c81f81391e305d43397f4059/78311581860.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/233fcf859dd23fab20951558438f6e99/pijivemuk.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/57945444422.pdfIn PDF document text
    • http://silver1979.com/upload/file/53843523268.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/28056287444.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a36a7a007---mumelovibatepebukevuxi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l9h10mqtko5gcmd3s9ej3v6551/muradirokuwotejewa.pdfIn PDF document text
    • http://terminsk.by/pics/files/xexekuxofubufaximulitox.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/gifebimugasi.pdfIn macro / runtime command snippet
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/nibudifuzipodinanobefaga.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/55990017106.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/52991600744.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/fd8542ac8b46f6e6ce7aaf748e54eff3/raxovasosarusolorebifam.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612587f0de2a6---nagelutadegudawoxeva.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c74e01aa---2850837683.pdfIn PDF document text
    • http://terminsk.by/picIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=holder+and+holder+in+due+course+pdfPDF 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_off0000b0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F6 10708 bytes
SHA-256: fd0855b866a6368560a69fec98e86943dd3b7fd9ae0e12ce82a7cec53cf554b7
font_01_sfnt_off0000c956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 13744 bytes
SHA-256: d6d529f0f0346e03098c526a539da951fd66c5d712ea9289b708262a707d3153

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