Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d888fa6419c2623…

MALICIOUS

PDF

90.2 KB Created: 2021-07-26 07:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4813077a80d045f6323120b0f8271106 SHA-1: 348dd6876fe90d2bbd8b8a1257089a6002e10ad4 SHA-256: 1d888fa6419c26232402b2b2b346d53587b0810cc489c32c81b704b61f892777
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://re-view.online/fckFiles/file/botepodapakajoxodot.pdf In PDF document text
    • https://aawyx.com/sites/default/imageuser/file/17697965152.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/a0gmu12an40ois40271ht0k9m2/temekedagusafuxulepegu.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f08ba57696---josufir.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ababe78c894---39376459223.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087e875772bf---gozas.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/9062e04f3bfbdebbca0d5be3f0912091/12095837324.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c58472ddcde---6987803665.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/h8868dq67op4hguh5p6lva7e3v/98006989510.pdfIn PDF document text
    • http://iteequipment.com/clients/65150/File/wajaxi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2e2f41923---janexevojo.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/dq1v4g2fqf9pjbk17558l1465j/mipiberewiruxasuzomo.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f58501388---zewadepexagatejebesavajof.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca81a34c21---zezedobiluko.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608879fb31c1c---97527478713.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc7cf4dbd1---kefagebilizum.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/botaviwu.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/39858846472.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/56310081530.pdfIn PDF document text
    • https://shopabrang.com/images/files/62619484521.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/eq3fo2t7f1c9vubs4tfqda21ff/84648426106.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/36138701126.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a21d33752---taferubuxuvabugavu.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/86190119841.pdfIn PDF document text
    • http://ewinghighclassof1963.com/clients/e/e4/e4cb61fc1babc639533983e887b7272d/File/69160740715.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c643c57e0---73483486158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=magnifique+est+le+seigneur+partitionPDF 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_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 19264 bytes
SHA-256: c85e600ef3fa183080e2902777499198f536063730d9dbcd798cf2c81757ca9b
font_02_sfnt_off00013f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 10772 bytes
SHA-256: a2417dc1e38d5dd77826581a1e58febfb95ceb7baedd6188eae5054f7d276948