Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a48fe40f05b301a…

MALICIOUS

PDF

78.2 KB Created: 2021-10-11 14:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 660682dbfd3797244efade448d751980 SHA-1: 5129e33c2c88cd1f168052b78e38519c584670b6 SHA-256: 0a48fe40f05b301ae1bdc7a5d78c9d968c9bc86178dc6b97d277bcdb379738d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, likely intended to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://nissanotogovap.vn/uploads/images/files/gubagigax.pdf In PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c7f49516ad---razewufalod.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613870329b01b---tenetulirapewipumokabizit.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/87527562362.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/39831745048.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/kokosuxunopelogofeto.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/kixize.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210915_99551AFF4627CE6F.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378985534c9---10961839952.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/93604916071.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/72200395534.pdfIn PDF document text
    • http://idroter.org/userfiles/files/53188915853.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/pugel.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/12054922195.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/ratatakisatumeri.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/zamokuganabuwojarux.pdfIn PDF document text
    • https://anaksemut.com/contents/files/75501682316.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/ba638e.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16146481438d3b---japagapulaguxidipa.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/dulijujazinogekixatel.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/TxADE9PCSUw/uplcv?utm_term=ground+up+landscapingPDF 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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE556 10596 bytes
SHA-256: 29fc843c18de08ae086f3391c0940e4c35e6252e60db22ad335064ea55981187
font_02_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 17856 bytes
SHA-256: 50e58c70a452e70377ecebd391be985a1cf9514009b4f11f399b3883c97c25df