Malicious PDF — malware analysis report

Static analysis result for SHA-256 745f4c047a797b62…

MALICIOUS

PDF

85.4 KB Created: 2021-07-04 20:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 96e1415519969d1cd5031fad47d8fb32 SHA-1: 7cc2ca55d50649092424a904b836350213e95c6d SHA-256: 745f4c047a797b6295cec27b170a680935a806b723710c3414356df23a401cf3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is unreadable, but the heuristic firings clearly show a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://footballsod.com/images/ck-uploads/files/gudekibipezetotazan.pdf In PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/58cd64aba4d5ee4d8cd093da7e949819/fotefuxodabopopukados.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/7415e2ebfda9ae471b84945b984c4344/fudubosinuxepijuze.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16098402d00078---fanimodapakukozixogiw.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/68474180994.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f1bec69731df29640217b6f3a6a0cb71/59646436080.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/f208a98b7b928c84a6b81332bed6cd24/jabutonuzerijosugazana.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/916d2f40d4ff02fd98aeb4874e67c464/babedukeko.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/59567820187.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7509a65d9786f0f2ea3a3110cdba274b/jogaw.pdfIn PDF document text
    • http://minerva-collection.net/files/files/14507123327.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/tozagevukixelikivup.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ecfc67b05---bopajezidoguzafiluvuvik.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/58afc0a25a7503f6406864b7df948f32/tuvigaxexazi.pdfIn PDF document text
    • https://nadamasristorante.it/file/75558395595.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b170ce73abc---74761809307.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4e67b1dcd---10535087194.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4ef0be03b07795c3525905be00641fc1/netidozerezalinaxosu.pdfIn PDF document text
    • https://mk-promotions.com/ckfinder/userfiles/files/31133961383.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/df7bce79e4f1324a864ccac4ec8ff27c/bakutosekodikotifokawiruf.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ae258af6f---kisuzezifizamekolodil.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/misetebiguwuvema.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/67i04imvqmjngspdv6e0ankcbj/30160017210.pdfIn PDF document text
    • http://artospace.com/pics/file/23771094299.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/wunimuziv.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/bfac92dcf0b42fdcaa4131003a723ef8/kefesinagono.pdfIn PDF document text
    • http://immopolignano.lu/images/zixefoxavetilumusosenema.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=quantitative+reasoning+questions+and+answers+for+primary+5PDF 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_off0000eb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037D 11500 bytes
SHA-256: 709100e0c2f11cf8e7db5bcc50efea19545d0d7e88eb85fcf302eff590c78733
font_02_sfnt_off00011e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E69 15968 bytes
SHA-256: 27610227d50d967d7346d2881f1b78b2c34e2aac6cdf7e2d695d0963c32dd247