Malicious PDF — malware analysis report

Static analysis result for SHA-256 1218c96da1f39ce0…

MALICIOUS

PDF

76.7 KB Created: 2021-08-01 09:37:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 73c497dba0de486f921574364b1259b8 SHA-1: 1e89c16e912fc19bbf27b24924b63c30119dd265 SHA-256: 1218c96da1f39ce093759fb3e4ade560d566ec0e586d63f974a08415662e535f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d692bdac2---41901029134.pdf In PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/7dc124352c8a35dd0fd9c1603a7809c7/wovevubakuxerefal.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/03531d4bcbbab9dfeb58212f2cfd42db/miweletadipoxesado.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e6924b87f---dozas.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/91780384119.pdfIn PDF document text
    • https://irrisyst.eu/files/file/pejizodokomadagawifefa.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074627439934---27411788888.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/vipoxamo.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/456ec684454cc45fea7c981130bcf2dc/28466108600.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/fuzojuvaweratof.pdfIn PDF document text
    • http://kennycojewelry.com/userfiles/files/202106/1623438103.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/89157802508.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ssi0s6j04hhg36r2fklr87fmd0/fixijifufu.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/fa018b5aeb8b6cc0aa496d18e48a5dd9/16667646746.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/pajatiti.pdfIn PDF document text
    • http://chsbicentennialclassof1976.com/clients/c/c2/c283bfa2537a82fb79a670aa087b4bd4/File/vusaripopunazebepo.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ade2842928ec8feef0e26e37edf7f99d/suxoreru.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/sebamevagevobivefawo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/de68d67c09d948fc27bcca5ea65bf865/sesowivuzipolufo.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/115a86f26d9de85077a12daea3b09364/40388048334.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/15834661055.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/68044826467.pdfIn PDF document text
    • http://rainesclassof1980.com/clients/3/31/314d3ac3c31ee16cfc8f78d457af0ebc/File/16786421054.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bhola+hai+bhandari+mp3+download+djPDF 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_off0000c441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC441 10840 bytes
SHA-256: a5439b53149a5929a5ceeeb0b61f3b577fed9a852d101678727405ae1f1a842c
font_01_sfnt_off0000dcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC6 18304 bytes
SHA-256: 1775de949f0a8827a6074adcd21a580efea61ec561e32efeaf58765d1e7fb4b5
font_02_sfnt_off00010bf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1