Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fc562831fc715d…

MALICIOUS

PDF

90.4 KB Created: 2021-06-30 07:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d4acedda16a04e5ff0a95fd8072e098e SHA-1: 71970d3d3a960de56d856c9a10ff6bbb0b8de25d SHA-256: d8fc562831fc715d3a523c5bab2fd26be4935f50d1712b6c90ba0ce1f24ae592
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of a 'link farm' on disposable hosting further supports this, as it's a common tactic to obscure the true destination of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bdd2570f2877501c25266c01ef455b12/1089500509.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db59804a35d---34674425855.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/26fc6938e9674c4a731b3d6d4b54aabc/wufajejegadorubeki.pdf
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/1782ac9f4a9340217a3902383b13439d/gowavabovavum.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160913f28068f0---42609074066.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/dc95d6b7ae4e5ffadafaf3fc58087e7e/49099621135.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16074f97b46a18---40526293219.pdf
    • http://dietetyka-24.pl/images/files/botabikusedapo.pdf
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/92831698853.pdf
    • http://zoncmswebsitebeheer.nl/files/editor/file/42608348781.pdf
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/lsmn5utea8u98jbdk77c71023l/37666993330.pdf
    • https://angelsstaff.com/uploads/file/xakulomowovamagaler.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/654dca123043ee79d579d33e9e3729c3/tikofoputopop.pdf
    • https://consultingexpert.eu/fckeditor/userfiles/file/xofatabenuzixudatopupag.pdf
    • http://sanarina.de/ckfinder/userfiles/files/15029714185.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/f4098a5d04844bfa796e612f494d2089/71795089384.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160791d5a61afa---88114098902.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/fdb00dd5407dbbbde093f2ee3a8f7ec1/4716226406.pdf
    • http://szentistvanpatika.hu/upload/file/refadazo.pdf
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82746091300.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ce2tuhrf1bglp3pj1i528sdo00/52310554086.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a777cb67a19---wejulen.pdf
    • https://bursakaynak.com/userfiles/file/jidotabivulibimomodoxekod.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b29546080---86970229796.pdf
    • http://iburgisidimarsala.eu/userfiles/files/zonuvibojejevebez.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/danimo.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/eaa62690a376e48df9336b4ebd0b5768/bupekonadiwo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=sample+constitution+for+an+organization
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
font_01_sfnt_off00011560.bin
93e8bd81cc798bccce2ed2a1349306e346d78b60daceb375ed31bf857c23ba6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11560 11056 bytes
font_02_sfnt_off00012f19.bin
e1750b7ca05c30875cb8165dfe774d861b92976f84edf6e2f3dbe80bb14b1f53
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F19 17248 bytes