Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e9caa048899722f…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 22:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a696e4c4947d32108ba67b5d09d914 SHA-1: 5c8e2cd5132ec72fb5cb4a47c8778566496369b5 SHA-256: 1e9caa048899722faaa1a18a464d24bf63b7d1da4743382b60ea40ed0cb9fa20
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites. These links form a link farm, a common technique used to distribute malware or redirect users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/c992jvc7m7kfabgb5tpqvkg25e/kesamejebubaga.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb80e35159---nabasatadezebaxefare.pdf
    • http://airsoft1.ro/files/file/86389139781.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/8d196da63cd9fdf448aefc126f19c838/zeminipe.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/68po4s5j49pit8k6tdirecvpmf/29842634861.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/05fe9f684179bab5ee7b0fceced5e985/lekeliwufuwovorifa.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/545f02b4a839a34018cb43b27b03d2a4/43986195075.pdf
    • http://clair-environnement.eu/catalogue_dynamique/file/runotubav.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/abd2c10af460f534b41af804e9b13068/rawamevaxegowomotusopix.pdf
    • http://aaaexpressheating.com/userfiles/file/23611193798.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160779314d1cae---28062452896.pdf
    • http://kaizousha.com/js/upload/files/nidupijipukokop.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ae4698fcab2bb229de5f391136efbca1/mibesapakonatuselowam.pdf
    • http://www.deco-interieure.com/userfiles/file/xavufawenojarebigan.pdf
    • http://aahsclassof1978.com/clients/b/b6/b6117739535924054831d33ecd54b00a/File/binumolujamobawojerolu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/12d269bdae64905299ec378f439251a3/14869119704.pdf
    • http://aep-tc.com/cache/fck_files/file/pisipepaxidik.pdf
    • https://kede.org/userfiles/file/pigerirofuvuvekoseki.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/32886ac5ae1f34db1ff7cc739f2a2d86/tupokodanakofox.pdf
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/8baafadda2b80f98da9d133632289356/wubedejusigopunubotubu.pdf
    • https://akproauto.com/nbloom/fckuploads/file/pisugalewizajumof.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405b4b23b7---redisalekokokiwosefuje.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/337fd2d634d83f922449bf98fe52423d/17725249012.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacbf7cbb2---dotarexupirufulibilulov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+get+gum+out+of+carpet+with+vinegar
    • 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_off0000ed33.bin
d63cf24eb2564f1b3623a111e864bf7f1b9ae0dbab306ab708a745df4260a356
pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 16572 bytes
font_01_sfnt_off00011824.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11824 16792 bytes
font_02_sfnt_off0001303b.bin
fe32bff87f5455d4fda76cf0bb415f597f71b8fa46164e1c362505d66a59e203
pdf-font-stream PDF embedded font (sfnt) at offset 0x1303B 10956 bytes