Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a492bfc8347f8c…

MALICIOUS

PDF

91.1 KB Created: 2021-08-09 16:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 889287fb19b716c375b2de1aa41ac7fd SHA-1: 5f198d837e37ae56282ee2423725765a4925c929 SHA-256: 26a492bfc8347f8c543e8747f89fd9f70a68c08c0c11eec2faac3838f0dc4d03
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics suggest the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=what+is+a+metaphysical+poetry PDF link annotation
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/15969362849.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160abe37e39d28---28200599649.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/10564777237.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a1b04169---walamojenu.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/gavumomibejadupixifanokoz.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/rosusevifozararoziwag.pdfIn PDF document text
    • http://coreaad.com/DreamDataUpload/file/resulanizijare.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f265832ee16---98815022539.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79623471518.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/xogivorubifabaderur.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d243ee926a1---89018375836.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7hte157u0d2g1hikf5ugfai2k3/vowesewabesozu.pdfIn PDF document text
    • https://dafelia.com/files/50168180922.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/mnvc3d2034r6on5da8tvlugf4h/63732428907.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95e4abfde---30477732891.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/veredibuzovanugam.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/luvinavezajasisadakiga.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04c3ec904---tuwikef.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/7f6273584fdad42a205365d9804c4e86/fevivinixetitoz.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44af11a757---ketobakeneputarivoranu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/64248ee6663d1ad8c94ea61897d021df/bomafilo.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dec47990b---vuvun.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/zezugedemedufok.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/nigera.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/18355018405.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/vavotaneveduvape.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_off0000ffc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC6 17344 bytes
SHA-256: 77033d93851176038835ebb43c1e3655230b6dddd8c26d2f75e3a7c3724d867c
font_01_sfnt_off00012cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF1 10644 bytes
SHA-256: 62ef00d2d984a199bf904360d4835f3788563d5bc7437bd66540614e265fbc5e
font_02_sfnt_off0001455e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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