Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fd8889a60b8dad…

MALICIOUS

PDF

87.2 KB Created: 2021-08-08 20:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dfab53154deb7bf3bc7b4f2c1f139c0c SHA-1: 9d29f08149c14c78611a8b26b83d2c01958663a8 SHA-256: 19fd8889a60b8dad678e39cb6c079066dc17bbcbd35f91815d499be2578d275f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. While no scripts were extracted, the embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073d677b985a---5261592269.pdf In PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/tefexozibirofuduvoruxijow.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/64431530170.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/8461956510.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/98976957196.pdfIn PDF document text
    • https://0900107678.com/upload/file/76258213453.pdfIn PDF document text
    • https://schmitz.cz/res/file/32945265648.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/79558750384.pdfIn PDF document text
    • https://alutat.com/data/file/safefidilejiwigejeje.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609defeb889d2---74748422926.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/tbh8c65298crgtdk26konads3p/35792198084.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff8b63f849---47097566670.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/10309232611.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/vifejil.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/68457911408.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/wimotemawiselinunew.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d195a15fae---37730004661.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/80496835627.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/46931854752.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610965393d147---87100581242.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0059f72b58f247239b9c055a6873eaec/16317376167.pdfIn PDF document text
    • http://valleypainclinic.org/userfiles/file/tirizumux.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/be2d4f064e18f61c8e87050c6eb81533/jodarawujoguwidubaxi.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/5568358379.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ovfa3kmah9a9o4dhq9chf8n0p5/20511176847.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=caballo+de+troya+1+libro+pdfPDF 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_off0000eda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 18380 bytes
SHA-256: 00709bed09a0f858959c33f91d2814386be5204d2294b0fdf6eb5005f10022bd
font_01_sfnt_off00011ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE2 10556 bytes
SHA-256: 673e34cd8ec4775859c4bbe4fc3e0b52333df2a74237e165845b5ffa9c828b86
font_02_sfnt_off000134f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1