Malicious PDF — malware analysis report

Static analysis result for SHA-256 5211d0e223916939…

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 03:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 62741625deb40b1c154ded82dc29a19c SHA-1: 79b3967c9cb0305390b6dc6c2f719e2a42801237 SHA-256: 5211d0e2239169394d7e0d1585c521b1f65f4f1d8f7970fb70729e1abb4d8b79
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 URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://shop-ecobati.com/medias/upload/files/54878968276.pdf In PDF document text
    • http://viajesalaos.com/webroot/img/files/mudepupimoriruga.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/57d80d46b3ac00351fdf5576a31b455e/29239716214.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/65185025416.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/fuzeveralowa.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/zebajumugudadalatazuxus.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/98837197659.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/wunemitodurofunaragexox.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8f7109365---jiwuwanumaromizalirog.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/9867185013.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/35387523482.pdfIn PDF document text
    • https://carlojans.com/cms/file/7299508443.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/451df13aff5c2a64c8d1b7c1a6a83d88/14220361104.pdfIn PDF document text
    • http://nessium.net/userfiles/file/63408396169.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/73632daabd0d436e78e09f39ce9321e0/42102133537.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/semenufudiwafer.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21c1227aea---fabafumuxodivar.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/31i1j8v1a9cr08b7m6259o35qc/niwuliwosamogosik.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88e1b5a89f---5776305147.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fcba50c5---wufadanirekogitawumesuj.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zajavaremivubemesi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/b640p118941evvm5ogjmp8msm0/lonizevupedudetenivese.pdfIn PDF document text
    • http://asianmosaicnyc.com/userfiles/file/20054626597.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3681qtk3iu37ggj45l5aaeqv16/kigadawopi.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/mapamas.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872a625d934---11325345832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=bull+terriers+for+salePDF 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_off0000f677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF677 17768 bytes
SHA-256: cdf1b7aa4539a70ed720634ec12a2b1c7a107f36984acda97e214964b22bc045
font_01_sfnt_off00012540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12540 10256 bytes
SHA-256: 85b69eddccb005daac7db264622354550638fea92129ee62767e253a2ee908f9
font_02_sfnt_off00013c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1