Malicious PDF — malware analysis report

Static analysis result for SHA-256 410038324e297bd0…

MALICIOUS

PDF

100.7 KB Created: 2021-06-26 08:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3a940f0f450379733c8c70f9adae9c1f SHA-1: 7139d3eb4a354e32fe0ff10267ebc14dc49c3b64 SHA-256: 410038324e297bd0c1ae147e3c945203c9cbff03542bfb01ffea3a09acd26816
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other unknown domains, which is a common tactic for phishing or malware distribution. The presence of numerous external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/1ocmopqqtqjj1pjj0gvv9es8ld/jegitagene.pdf In PDF document text
    • http://hurtmar.pl/Upload/file/bidapudiwigexu.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/84800378061.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/4tkstuqec5ikbnh7gfj3h1hjj5/fujebo.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160986a82315c7---tarosuv.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/27593991300.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/jc3jrn2i7m99ua8gchh1kub372/7189993100.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4329afea09160d588e7ee83ee1581e7/33337054201.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/15220336653.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/mumokaxugeboluligage.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de9c4269c---13794357858.pdfIn PDF document text
    • http://www.bash.cl/media/file/losefujadaravukoru.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/73407845909.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c99b7b6b451---sodesonipelekipafu.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/35576492316.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a85b4ece4---xijadituvitip.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/44817691222.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/pogalis.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/fogefivujakuruwozojadewa.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/mcgg4p257q6o5ma2r0i149s892/69421012576.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/7td8pdpnug5mtnsgvfrr20pjnf/lofenanuxevidavevedu.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/vupav.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9077087669---zolegupe.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/sanogazenarejonijo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chihuahua+and+wire+haired+terrier+mixPDF 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_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F98 10496 bytes
SHA-256: 8dd0fef93cc7820dc49e70adcea134fac55ac5fe32d463f406d3170209ef956a
font_02_sfnt_off00015753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15753 17716 bytes
SHA-256: 16eeeb28e6d67eb4068770131ee5079587bb34273c6c5df3468b2632d60e6d69