Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a70e8f77beb0ea9…

MALICIOUS

PDF

107.4 KB Created: 2021-08-13 17:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4d0240545dbbc99df0c09e337df4947 SHA-1: f4958b8520882e3273bf5c282eaadbe1fb4e1e12 SHA-256: 2a70e8f77beb0ea90c909bb1935251e23312e28125fdb72210bc106f41040e5b
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/0uq585qb24un8t3r4f15a806tt/fogaveja.pdf In PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740100dac3c---soruliresivotigutojexurul.pdfIn PDF document text
    • https://digireg.se/upload/sozututexivukapepibusuwer.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/buleda.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/xubavugivebenolonatoj.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/868110372.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/ruwuvukero.pdfIn PDF document text
    • https://airshow-bg.com/file/lowisulakazerutelanas.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/16447311535.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kifujono.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3cdb6c3df0da89b5ce6b9f3052731c45/34575824517.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/11172435689.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/6a78c42addf0a4bcf7a5380bf4fb2d0d/wesarolan.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/bopadetiwadewozixog.pdfIn PDF document text
    • https://cecprint.com/images/file/29553766469.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16073dfe30f244---fifasetara.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1d6e8c11---68997941962.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0d63c0f8e7a8eef2fb261b77f29691cb/gurisiwifidusofa.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e307d1f52---gimipifalowa.pdfIn PDF document text
    • https://verner.lt/images/files/jimoj.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/vokeruweku.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/045f8dfa0f90211984465f16d43a8e21/xetolixabibikubezusuzu.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/4477381921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=le+roi+danse+film+entier+francaisPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001233f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233F 16192 bytes
SHA-256: 97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
font_01_sfnt_off000138cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000150dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DD 20552 bytes
SHA-256: 231c5f770bf3e7eb93182caead5a1abddbc51bd97578250dded858dab9c96e9c
font_03_sfnt_off00018496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18496 10596 bytes
SHA-256: 347e317e3f60d1377fcfb9639baff10d8898a4a365fed08c66cf85ca309312ae

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