Malicious PDF — malware analysis report

Static analysis result for SHA-256 f74f2ea133fca58c…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 14:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ad8b9a7d380b67d0464482ea41282b53 SHA-1: 2e5dc298a83582ae866bcf93755c0c739de35f45 SHA-256: f74f2ea133fca58c5a18e593a147e6ef0a332de3614158ecf61f66eccb1a425f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm designed to lure victims. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document intended for user execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://harryreichert.de/uploaded_pics/News/file/2409455515.pdf In PDF document text
    • http://1carl.com/userfiles/file/1246273661.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109221533311137.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a2b331cb7e89e93ba9b3800a4a8b0fe9/xoliraku.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kelelup.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/10613697381.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615261764d360---golagodel.pdfIn PDF document text
    • https://ceramicasvillaflor.cl/UserFiles/File/8041761675.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/59641828915.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/5304198472.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/kitezipubozevobawexitako.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4b247877292a0a7edc2618fbdc29a337/barozetigime.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/wogepibofedutuwoteziv.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142518addce6---pexumuderavevolusi.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/87285939688.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021926236528513.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/77416959161.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/mejukanuxuzezirivu.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/kozusejopovorugoj.pdfIn PDF document text
    • https://siroyensao.com/upload/files/mozanasaxu.pdfIn PDF document text
    • http://goref.ru/files/file/83226458136.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/potirew.pdfIn PDF document text
    • https://dootion.com/data/attachment/file/3711332754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=injustice+gods+among+us+read+onlinePDF 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_off0000af22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF22 16980 bytes
SHA-256: a7c23f94390f8b71367c79593a550fcff0ac0240596b7fdc50c072e938ebae73
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 10896 bytes
SHA-256: ba513851cad5692bd984606806901c947873f54596b5d05d3bc1e2990397e931
font_02_sfnt_off0000f3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1