Malicious PDF — malware analysis report

Static analysis result for SHA-256 322a118202ecfc1c…

MALICIOUS

PDF

85.9 KB Created: 2021-10-23 20:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: a9f467b5a8325be62c0061706bc88a82 SHA-1: 207dbf86605e64f57c5da7241184f1140b2f12c6 SHA-256: 322a118202ecfc1c7d0e743a360401b22777ef9d7744004d280c07fa0113d922
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised WordPress upload directories or disposable hosting. The presence of 'utm_term' in one URL suggests a potential phishing lure, aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ninda.vn/userfiles/files/12004646928.pdf In PDF document text
    • http://stevis.cz/files/file/gifapatojadatejoboku.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-28/20210928112440162097.pdfIn PDF document text
    • http://xinyuemu.net/assets/202110/files/20211008234808474849.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/pagisununudotis.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/mizig.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/pamoputuwagonugisugal.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/86183947484.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/2905286015.pdfIn PDF document text
    • https://la-klamm.org/Files/files/78266304009.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210917120713109.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/08cb43bf6d2dc47c9dcaa13ac8705339/24737802805.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16172c888300d7---27232990270.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/36233328992.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1616ef6824a18f---13684104291.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/radipesufome.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/bojalar.pdfIn PDF document text
    • http://virus-safe-zone.com/ckupload/files/nafesofemitugutavekamodo.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/78195437592.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0214337be2a6cee07b8ccc197d7ece3f/fegononepelanalibeni.pdfIn PDF document text
    • http://sparkpro.lv/content/file/76688883471.pdfIn PDF document text
    • http://net-marketing.hu/images/files/wekagokibud.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/n722ku308fed05gn83ub6q54f7/64430484513.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/2I9n2o-U8HI/uplcv?utm_term=itunes+for+win+7+64+bit+free+downloadPDF 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_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 10920 bytes
SHA-256: f5118e4ae900f4718e3c1e07cf735463ca35213fe4e75a46a12299c72a099e02
font_02_sfnt_off00011c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C67 17608 bytes
SHA-256: d72f651916bdcb756b62b6d02b95afa753075452833a2b007c87e1e2eb58190f

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