Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2635d56e5138591…

MALICIOUS

PDF

137.8 KB Created: 2021-09-09 17:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4817caaa3b0ea313d01a1bd9a4954d9b SHA-1: 6bcc05e44f7178490ae80b4356e4141478ad8850 SHA-256: d2635d56e51385911fb54c61521df26b02673909a78f8f347efd490c21fd3aa4
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or trojan delivery. The presence of external URI heuristics and link farm indicators suggests an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1526c13e17a93ced838e77288c0f980c/dinawogagufutanigonuzej.pdf In PDF document text
    • http://mygiftltd.com/userfiles/file/pemuwokoloparugo.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/wonodusivipegagud.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/loberodopalixamilikab.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/34253334292.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21893c085---degerutovose.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/gawosafapoperikobaduj.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/37689436970.pdfIn PDF document text
    • https://istanajp.com/contents/files/79290852998.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/zujiselalubamo.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/nezejewotorakegojebefa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bac2f3d33---gexilanatosusitewedeto.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/wuxavawofujalijubafok.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/41689754138.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/35863998199.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/65111242469.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923493434a---faworotabolapuxozi.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/25191010277.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210905_EAE2FE87851D9370.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135525e20dfd---zololawow.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/a9f13f3cf0686e337dde81a7d840ca77/93492658787.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bubosurodan.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/lajife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=euro+truck+simulator+2+download+link+androidPDF 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_off0001b1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B1C4 10780 bytes
SHA-256: 7373608bbf7a79789569e7803f3c5b817c9f750d25277f2acb48201932c6fc23
font_01_sfnt_off0001cab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CAB1 19904 bytes
SHA-256: 55d18502454e439d0af80e7274496d5dbb0abc40df511a888358e833de68f996
font_02_sfnt_off0001ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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