Malicious PDF — malware analysis report

Static analysis result for SHA-256 faa479a09afbe2cf…

MALICIOUS

PDF

87.6 KB Created: 2021-07-18 20:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 79cdcdfdf24d421c541c4fb488e5e0d5 SHA-1: d07fceb36e0f5b84bc2c1b8a472afb533dfd7a1b SHA-256: faa479a09afbe2cfda82399458b85bbfdcef3438fabf66384f84a4a22ce5dd3a
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 and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/aajithprqec53cnq54dfm21n4p/sogarolex.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/5604925452.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/dazazorutufugidur.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/0c20a593287e658d6b6153610047adba/40814742372.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/c39ac4bee5c577a3cbf4e652dcfd34e0/43339730546.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ce5474487---jamawarukejer.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vifakos.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/sitelifaviwupuzadomes.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd4ed9ddc---dagat.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/353e324a6ba9b809c2548d747bf538f7/lizepoxiguvekelepuraseb.pdfIn PDF document text
    • https://esz.jp/img/editor/files/34338186730.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/82310754525.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/rimijuliranefolenujozopiv.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/vunorimusotanide.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607678bb9055e---38168125331.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/81477468302.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608732ca7b0ec---wavibosu.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/53607483396.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/bofosulutexubadokefinina.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/pusolaxigatogizijis.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8badc10d7---59951811604.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec077d7342---35929350478.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/6c6c802ae2972ff8c2ff609905578033/pewuzadoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=can+we+reduce+weight+by+walkingPDF 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_off0000f4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A6 16772 bytes
SHA-256: f2b83e118ef8468099992b120f952be8ebd8cfbaa1d9a122d308ec74517a440d
font_01_sfnt_off00012054.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12054 10924 bytes
SHA-256: 00e65e563ee13067b1567c31a2ad9e9fe14cdb0e7d2ae30382779aacb3ac73e8
font_02_sfnt_off00013961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1