Malicious PDF — malware analysis report

Static analysis result for SHA-256 38a97a88405401b7…

MALICIOUS

PDF

89.5 KB Created: 2021-07-23 12:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d17d592437d58b68b3d0c97aa670df7 SHA-1: 301c906ffa522aa800047bdfd8d40a0f1a05b01c SHA-256: 38a97a88405401b7bc2b87aff71c277456049fd731601401549ab7863f4ea4a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised websites and disposable hosting, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/dd7ef25a0fa3f429a4559a7889fad868/57758222191.pdf
    • http://intergeored.com/upload/File/wofof.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4ffdb42c4a516236ebab552c8cf0b32a/79510662080.pdf
    • http://bunny888.com/ckfinder/userfiles/files/telesufazute.pdf
    • http://www.deep2001.com/images/library/File/89161310945.pdf
    • https://thefertilizergranulators.com/d/files/96676681127.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/4884500766.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1222a2e8de079f37584bbf8710282c6b/woxirafobozozotewusawi.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lft8s4i5u566cqf12r9qlo9j25/33459415830.pdf
    • https://clearpatth.com/userfiles/file/57568102088.pdf
    • http://weingut-suppan.at/files/25736945210.pdf
    • http://gift-founder.com/archive/upload/files/rilixa.pdf
    • http://mt-filtration.com/uploaded/file/139274249660df818130997.pdf
    • http://stalmost.pl/userfiles/file/89311136331.pdf
    • http://premiercontractinginc.com/files/file/47571136770.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/4ea0a985b3b2bca903a9c190cf36f503/70193783805.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e08790fb41---17396362098.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/63e864eef831729d0dbd4979e09d97fe/79291845863.pdf
    • http://studiosiciliani.eu/userfiles/files/rufanepukoxomuxobav.pdf
    • http://littlepearlbooks.in/data/eimages/file/pasepinuvo.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/965aa0f41c6d4b1a95729b25a8c367e2/gijer.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b1416beaf---divuvene.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=best+game+download+site+for+pc+free
    • 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_off0000f96b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF96B 16792 bytes
font_01_sfnt_off0001117d.bin
def9d78c5f374cd3bd69f41104d422ea9f34bbf2c465933173e775c4480a8493
pdf-font-stream PDF embedded font (sfnt) at offset 0x1117D 17260 bytes
font_02_sfnt_off00013e9e.bin
43fb31513af66e2bc45a4fcba8a163efee7dd0328631b6ab73fca3836950f56f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9E 11100 bytes