Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b8a332d3a172c3…

MALICIOUS

PDF

69.8 KB Created: 2021-09-02 05:32:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c7e7ad963904788cc1545a643f1dbad7 SHA-1: 968f5810cfc2e319f687bb8431d4b9b4d4020066 SHA-256: 21b8a332d3a172c3daa3aab5cc1ef5aedb2e418571232b9ebfa7bc17882c4a9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. The PDF_IMAGE_LURE heuristic indicates it likely contains a screenshot to trick users into clicking embedded links. Multiple heuristics point to the document being a link farm hosted on compromised CMS uploads and disposable domains, suggesting it directs users to malicious websites. The embedded URLs and the document's structure strongly suggest an attempt to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • 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 69 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.
  • 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://pistant.ru/uplcv?utm_term=dna+is+protein PDF link annotation
    • https://ambalatender.com/upload/files/84211989569.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/5f8c9bd804e309e2fcc042ac89dbd1cb/tuxederibudenogubunuk.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/438beb5d6646e7b0afcfc014907b3943/forudokafoxinadame.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/71533152521.pdfIn PDF document text
    • http://ud2-140.com/files/58766578255.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/93757413110.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/b11731f2b25f72681973918b561ef670/ruragixur.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/fe5g2hta91ngkp1h9v6ifhu6ap/lavikuweduzudameto.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927684bd00c---52562740611.pdfIn PDF document text
    • https://siroyensao.com/upload/files/41108757270.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/1813211675.pdfIn PDF document text
    • https://vientangluc.com/upload/files/gamugedogisujufexuf.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/movarofowos.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/mopox.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1606e598498ef7---99662299832.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/telerigegikajuv.pdfIn PDF document text
    • https://dalyanestate.com/userfiles/file/3241265643.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/58218477667.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/medagolazatodoturonuwux.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/32079051440.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/90997101796.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/280d410a2cf3a5716648d257c9eb6b26/13812733011.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/7562292671.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c46c424aa---695257844.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_off0000b687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE99 13812 bytes
SHA-256: 8f04ad52603269ed2b0efebc0c361c09b815a850466bba62623d2a22a09f899d
font_02_sfnt_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 10200 bytes
SHA-256: 87201ceeb47edd64a76c1d800464da28fc61a2abbfb153eb2cb7344f891b1f65

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