Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9442ebd8ed6073…

MALICIOUS

PDF

91.6 KB Created: 2021-06-23 18:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 0219bd18991e7987631582a9bfe5cd6a SHA-1: e117c07d7641f0e3c8a507867c1ad911f8f7fca9 SHA-256: 5d9442ebd8ed6073d0fbd88878216b52656c124567c47f06356003d1810af4a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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://synerhu.ru/uplcv?utm_term=de+pdf+a+jgp PDF link annotation
    • http://centralcogtc.com/uploads/file/2417792704.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/mejoneliviwuvajibaxije.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607146e365034---lolutikug.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/fimomiwax.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1b9de28f9---japuwarobokutefipimelub.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/65873747598.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/20333197273.pdfIn PDF document text
    • http://huiking.cn/uploads/file/072003186450.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/9r37jup5eogdndq950mk57sk84/wowuzawibadenabew.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/mopanopuwisesowirowojoma.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074994591c99---jinabotiredugelaxinade.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/tijozeronagigegosekos.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba48d360b7d---31466639338.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/12588897276.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/l75iqia23ie9ihq7cje6jbrfcn/31746455850.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • 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://scripts.sil.org/OFLIn 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_off0001036e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036E 4424 bytes
SHA-256: 7f29f51504c097c0fabfea042efe5fe8a5bdce073e11ab0b40f56176b25644a8
font_01_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 12752 bytes
SHA-256: fe1016b86442565ec5bc1b406d9f2f38091f6e63f659f39a40cd1030e77c7e7b
font_02_sfnt_off00013c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6D 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230