Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ae8e67d8a45e751…

MALICIOUS

PDF

97.2 KB Created: 2021-07-30 07:30:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bbd3328d459992f64ddaa2a7c095309 SHA-1: 9604ff6d054d0bbf7d745658d7d3cd5526906fe0 SHA-256: 8ae8e67d8a45e75137e9764af58f9837639e2ab071afd4e74c6068d6dab70051
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://krisoc.ru/uplcv?utm_term=why+is+the+perks+of+being+a+wallflower+a+banned+book PDF link annotation
    • https://12shio2.com/contents//files/7385315757.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/28949869064.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/21426660905.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/49573920372.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/9b37e2e9b9159edae86136b62cacd581/37790008426.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8690a380e6744e9176f16ca433259b1c/95318640056.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/zolibex.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/72807387643.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/693631791.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/85887629551.pdfIn PDF document text
    • http://bjallstar.com/upload/file/7411344749.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607444e67c19a---wesetarabegexapekut.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/45369959753.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/15587951920.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/e64t967t6eung2ufbv27gg17m7/xovebovetepopawipuwon.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609183a83b224---kepanisitosazuke.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/84912537157.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fab628396f368c408bfa963c396d7e35/59738211689.pdfIn PDF document text
    • http://sns.hu/_user/file/lodutoxalipu.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/082258583826.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea8317705---kujefesurureforesome.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606fde6e46043---moniforepigopabalapaze.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/mijivadinexija.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c45de2d271---34597994073.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/55310805950.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d52e326b46b89351b8b72ff65e25a506/86873627513.pdfIn 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://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_off0000f92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92C 11200 bytes
SHA-256: 1e3660bba15bddec2bb396532b500c9f3211ca396966842b5b445fda1083d453
font_01_sfnt_off00011304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 17048 bytes
SHA-256: a9226c86a2978d877097202f6021a4da202632be21262550b1a962f3d21d0c5a
font_03_sfnt_off0001574d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574D 17936 bytes
SHA-256: a95dfc982779eeef6f6c3ae0520dbe784f53bdda9e7c20e99e3530ed27c533c5

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