Malicious PDF — malware analysis report

Static analysis result for SHA-256 c162e79333d2b4c2…

MALICIOUS

PDF

76.5 KB Created: 2021-08-27 23:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0b4e864fc34ac65cb40c6fcda2bc749e SHA-1: b5600bff43ca4594d262c4d7f19ace0053a5a6aa SHA-256: c162e79333d2b4c25248dd95ba57f0e681828a594b12347beffbd22ab2aa8347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that form a link farm, pointing to compromised WordPress uploads and disposable hosting, likely serving as a lure for phishing or malware downloads. The `utm_term` parameter in one URL suggests a potential SEO poisoning tactic to attract users searching for specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://wastran.ru/uplcv?utm_term=sinister+2+movie+download+in+tamil+hd+tamilrockers
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/559d855637ded8422b2d015cd217ed86/28879947895.pdf
    • http://connect-senior.ch/uploades/userfiles/file/76680248509.pdf
    • http://hb1004.com/userData/board/file/zujuku.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160af86d323e11---20334223533.pdf
    • http://rund-sro.cz/UserFiles/File/nivow.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/61266600207.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/2fafaead15fe1393aa247acc0b70e1bc/filakelosebisevajasep.pdf
    • http://hgbs.de/userfiles/file/larowadutawiximixuve.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815b9264a2b---zofifijanatujakaw.pdf
    • https://mfdesign.hu/files/file/domuwidogipolefip.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kqkntrtntfdnopevebt98h9gjr/7732976645.pdf
    • https://dafelia.com/files/50154351304.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b54d83421---26379952193.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9e6d0eabe46619b004ffffd1957e9017/23915081103.pdf
    • http://eprdel.cz/userfiles/file/sasolewuritowipapo.pdf
    • https://mmagame.com/userfiles/file/73899512175.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a08d547c---25123857959.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070530e3d559---10576318265.pdf
    • http://amdind.com/userfiles/file/zetijokuwoligamamitiz.pdf
    • http://nomaquito-travel.com/editor-images/punizisutaji.pdf
    • http://auksozvynas.lt/userfiles/file/zusubarosub.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0b1225ba6---kedof.pdf
    • https://bangprice.com/bangprice.com/beta/cms_image/file/mubebalujor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c661.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC661 16792 bytes
font_01_sfnt_off0000de78.bin
4b3e370e6f168f88ef6d2c21d81b30a59207921cf623fe0eb1213c5380e318db
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE78 11076 bytes
font_02_sfnt_off0000f828.bin
6352c9605234012adc150e5f14a91d8a5a908fe0b9b7be7b93787575516f04d9
pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 16756 bytes