Malicious PDF — malware analysis report

Static analysis result for SHA-256 364e19eb2c08ec3c…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 10:50:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b2b53d12985eb2411ac481aae078a0c1 SHA-1: 58d44f26692b7ee0b6b3580ca32cf3df58837466 SHA-256: 364e19eb2c08ec3c0ce05c518ef23498548aebb8a2748669ee5d188352db16f8
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised hosting suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://stillwaiting.org/userfiles/file/33940325064.pdf In PDF document text
    • http://dichvuwebsites.com/media/ftp/file/7357375021.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qe2blsv461vhbc3upn2ic4s3ef/33062596841.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160884dd4e48dd---97621951631.pdfIn PDF document text
    • https://kham.vn/userfiles/file/64486369120.pdfIn PDF document text
    • http://nieruchomosci-swidnica.pl/userfiles/file/61361013143.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/nodikaluremusakag.pdfIn PDF document text
    • http://juentai.com/userfiles/files/99461280632.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/58463368717.pdfIn PDF document text
    • https://elemonbg.com/Files/File/jexifapuxixisa.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/76qhkj0okachkj9es9qmp5uj0q/bazexunorolabutunagu.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/d725fc8b9fe699ea7ec48cb5bee0f4ea/ponikonajoxekori.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/35741976848.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/vitewoparitosopito.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/95f88805e718a8d49d7934a75f10b394/fazifapowuwusawodafadili.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/36653369509.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kbo5kqstov6n025jo62k8p9bh0/498041072.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d00c34086041804c342e5a1286274feb/jepapumafewejapis.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/84061406416.pdfIn PDF document text
    • http://js-space.de/userfiles/file/rukaxepubagavos.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/19792032333.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/03143eb942903831f6c8f19d5ebf491b/veputis.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/bilowibukigepofo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=english+ferry+literature+class+8+solutionsPDF 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_off0000cbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE7 11020 bytes
SHA-256: c115f858f6f7d92fda202b93483e12bc1a87ed5843f5c9b2b10140cea2cc5231
font_01_sfnt_off0000e580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE580 16508 bytes
SHA-256: a81619e8bfa9ae679a5b0f3242cddc3d7e7f9fda11d79bc5eb9cb7783d1dc9f7
font_02_sfnt_off00010fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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