Malicious PDF — malware analysis report

Static analysis result for SHA-256 8174d7070d173ed5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 07:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3b7cae321e0a24817b871398e1a1b6c SHA-1: 9049ee60f63e7e6374a2ee6784ec29fc579dc1d8 SHA-256: 8174d7070d173ed5a6030334ad9c1512460ae8f851c316c481546e9eccb974d8
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'invoice' and 'urgency' lures, combined with a high ML classifier score and ClamAV detection, indicates a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely leading to a second-stage download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://krisoc.ru/uplcv?utm_term=sociology+pdf+ncert PDF link annotation
    • http://cungcapluonech.com/upload/files/2895105233.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/melusupodes.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wolegimiwiposelusalugore.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/63179739305.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/wiwoberuta.pdfIn PDF document text
    • http://canoto.us/Images_upload/files/jiwipagilusazifipuwa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947206ab4e3---dikutasuxudofelozedi.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210629_ACE8E005BE873715.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/ee6de2547ce9e744b91c9c4427312f32/kuzexoruba.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/13496731035.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/faa15058e067f5125ca6adb3043485fc/rirajipisonunul.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/92812681823.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/94004113722.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/lozuvis.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0abb3b5d6---19370386765.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b58a9d1b23a---vuriwazorakekobomufawedo.pdfIn PDF document text
    • https://shinaltd.ru/images/file/bidijobovusonitixaxazefut.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/xebasakovepagif.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/72937f564d58f0b9373bb1120225990d/ziweloxo.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/fegirebo.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/gemebutaretomaviwike.pdfIn PDF document text
    • http://xn--szabowski-tub.pl/userfiles/file/falemikusajovutomabix.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 18564 bytes
SHA-256: 485bdc7ebcc6be671f0ff3e4763d36fa3c3c215c1513a9bf65c20a9bb8bc52ae
font_02_sfnt_off00012123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12123 10656 bytes
SHA-256: 90beb61652cf693c3d61b6cf35d349751d2472509b2a654135c2be0d67f420f1

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