Malicious PDF — malware analysis report

Static analysis result for SHA-256 b67a7926ec8ddcb8…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 09:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b75028f7ae2a0ce22a4b58c1ef020025 SHA-1: be38e177995b1df99a8a168e43fff33d0d77727d SHA-256: b67a7926ec8ddcb8d601a7bb167c79e1a445b68b5cc40968341249dfc74c73f1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier flagging it as malicious strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://smidgel.ru/uplcv?utm_term=which+is+the+largest+country+in+the+world+by+size PDF link annotation
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d927d75b08ae05ad35d570b3534f477f/70762669074.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210902014556_4c3vyj.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/waxasufasepumunijoluso.pdfIn PDF document text
    • http://suamanhinhlcd.net/userfiles/file/47969974589.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/kifubofumadegajej.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/i43i9q2b10djra4f8jj32ks4k3/gikiz.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210907014247.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/92116001971.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolusafumixigulik.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/60207087207.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/30336231191.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142182ebf772---nusikujij.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/bamagepunekilevoxigaji.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/kepubeti.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/74851484298.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/femibixojusuj.pdfIn PDF document text
    • http://akatumusics-ang.communication-pro.fr/public/1283/contenu/file/ramozexugopikakifoxuni.pdfIn PDF document text
    • https://baobiachau.com/luutru/files/16770894449.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/potukaruzo.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/fonadonaxalusupexira.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/12795536188.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/sebaxugowa.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_off0000e0eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 11140 bytes
SHA-256: 84b857805daf97dce2e4816bc8f35effa4de7356de14e0f42842a931edea561f
font_01_sfnt_off0000facf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 18068 bytes
SHA-256: b7816f3c68a2599c7301a824aff8823819c5bca5c8354cb93df3f1a156d7d5c9
font_02_sfnt_off0001298f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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