Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a60ecdfba4a7bce…

MALICIOUS

PDF

86.9 KB Created: 2021-07-08 09:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f2720ede2867006a6b7a11491e17d753 SHA-1: ec5c41f01dc8424d4196f9eab29c58a7646fe531 SHA-256: 5a60ecdfba4a7bcecd63c5e00f63b331bad579777604b0abf951a2435960f35e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, many pointing to compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external links and the nature of the detected malware point towards a phishing or malicious content distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c299ad773d---kenidi.pdf
    • http://liburnia.pl/userfiles/file/zevojosokinoluxawemi.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16079354b93f79---37714121901.pdf
    • http://nhatminhtrading.vn/app/webroot/uploads/files/pufapuresuwetonadabepojos.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609d03cb1c87f---vovuxosiredelafojuvaw.pdf
    • http://www.hmcpacking.com/uploads/files/95521385160.pdf
    • http://thuonghieutoancau.vn/uploads/files/96346271823.pdf
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/4hi9o29cpptehe22a93un28s10/21855788769.pdf
    • http://gayaarchi.com/userfiles/file/20210627101335.pdf
    • http://retco.ge/ckfinder/userfiles/files/47084483223.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/58g582vj3u44h9aiaipqfh0ov8/mimutagupa.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/87kjooggi937bo7hbng754ch6t/gumopavigogapozapifeje.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16084477a7f28c---62642498160.pdf
    • https://clove7.com/userfiles/file/53572932571.pdf
    • https://greenline.bg/userfiles/file/28935968990.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ipd61vddk1g0t16q8adqu866rq/nutimezogojodis.pdf
    • https://majorsagilekvaros.hu/uploads/file/tiwobikixupogix.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/4fnjqb5g8qhn0sk5gimirorf17/33928300183.pdf
    • https://free-spirit-city.eu/uploads/wysiwyg/files/95336688896.pdf
    • http://delvalle68.com/clients/54584/File/nuzuv.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ca2b8ddfd---45294411570.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+delete+a+page+in+pdf+preview
    • 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_off0000f0bf.bin
6174fccbb9ca46a0b39d9514492daf55be2e5673550def23a8621b2a3ef5444d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BF 17324 bytes
font_01_sfnt_off00011e2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 16792 bytes
font_02_sfnt_off00013646.bin
759c2ecaadf60d1c3ab5bba9463a08ae514d497fa68a6a8f5ba63231d70e0ce6
pdf-font-stream PDF embedded font (sfnt) at offset 0x13646 10648 bytes