Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa9a4e2a26ec8853…

MALICIOUS

PDF

75.2 KB Created: 2021-08-13 07:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 815ebbb34b12ec46c9fb9a06668514b4 SHA-1: f91e6fa834cb5a37361b9d30099a7ca51a23d95f SHA-256: fa9a4e2a26ec8853a8d197a24661ccbe67e3ed67a90c738838ad6fa75630c02c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gesgo.de/userfiles/file/pokitu.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ibbo7gaeklhl9cu9mvsasnil35/18629686171.pdf
    • http://jorkurojus.com/userfiles/file/18283969120.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d59d580cecd---36326822725.pdf
    • http://thuocnam.xyz/images/files/dapevipul.pdf
    • https://netpage.info/userfiles/file/82508996414.pdf
    • http://studioindelicato.com/userfiles/files/50497216178.pdf
    • http://22743333.com/userfiles/files/61422238560.pdf
    • https://palet-school.com/files/files/10623759350.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a14c8df9b5---rujupeganowipopolanivopu.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/turoze.pdf
    • https://vinadesigndanang.vn/uploads/image/files/87399252230.pdf
    • http://gdgom.com/upload/file/210801122827004922u1ut4xs83gmu.pdf
    • https://watosaphotography.com/app/webroot/userfiles/files/20210730_124708.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607511a837071---97234668023.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9c7ddc9025de87c9f221cd96b0904603/30907834153.pdf
    • http://www.rify.us/cms-uploads/files/86662232425.pdf
    • http://papinchess.ru/userfiles/file/tagikuxapoxotifoberuj.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/48a29ff0dd1cc93a681a926d13868106/62479121269.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c997a91baa---zafuwenixuwaroxidexil.pdf
    • http://ingenermarket.ru/userfiles/mujuxozokipitemowolut.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1906b38c4---42059243902.pdf
    • http://dongphuctqueen.com/upload/files/figavaf.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3868715c4cf0768704f58f267cfe9fb1/70538945945.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=american+inside+out+evolution+pre+intermediate+pdf
    • 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_off0000bf38.bin
87398d96a26dbd1717dce17095c8d9b3cdea474e1b48fa1a153f6c0eb8b7e4b5
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF38 17616 bytes
font_01_sfnt_off0000eb85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB85 16792 bytes
font_02_sfnt_off0001039c.bin
7e4d8b9f5c39ab52e3f139c2ea6c09c06d8df3b1c77844a7cdfc6ce29dcf7310
pdf-font-stream PDF embedded font (sfnt) at offset 0x1039C 10928 bytes