Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f96ab734f1d007b…

MALICIOUS

PDF

85.9 KB Created: 2021-08-17 12:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 23693c21d2f4d9de1a9b5e2f99a474af SHA-1: dae262c664d8930dfb11e3db936ddb442af580d7 SHA-256: 7f96ab734f1d007b11106aa59ca221d9099a034da34182d121722a4ed74ac485
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious files. The presence of a direct IP address link and a high ML classifier score further indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's a lure for downloading further malware, likely a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 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.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6d6cf2071ec7736336dbda6e25925793/122898164.pdf In PDF document text
    • http://alfadent-volg.ru/images_uploads/files/rakozi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4b55a1b41---45103195275.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c226e30ea35---diwokoxixixomawegopawewap.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4a46da6d---lufijabanumokezalokaxovo.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/mh5pleha5j5idmfk0079vhj67p/77716572450.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/26211244517.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/foxukirixitomowegemix.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080643a01ee9---32615297380.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/85984106983.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/pexebuwuganozuseremo.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/54defb5356c4a52651fb5e1f8095793a/gusakijanu.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/kebanejifij.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/numoxig.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f6486d93---xunurasexuxaparel.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/nalabevekar.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/46056837494.pdfIn PDF document text
    • http://wych123.com/upload/files/nifutelazotebazubixe.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609246b607c75---jibemipinibedemigavixu.pdfPDF link annotation
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e60b6b2d8---1309041180.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/pezexofijugodetowa.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607368ae1e0a1---wavebebaguridisokebon.pdfIn PDF document text
    • http://vtaky.sk/media/file/79261939034.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/xumoditaliveran.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/pefigosukivuvajediregod.pdfIn PDF document text
    • http://centronegozi.com/public/favolabimadiwikas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+millionaire+real+estate+agent+gary+keller+pdf+free+downloadPDF 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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B0 11200 bytes
SHA-256: 6d67b69a065ba36ae519bc3b74de56fb7a6df1ee4abb03834b3bb297e5dacf82
font_02_sfnt_off00011a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A90 17248 bytes
SHA-256: b45a7bd017b3069d7cbac5e4204ba85f29d164d96b952d9631e1b6191b06731d

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