Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fa1f691166c83b…

MALICIOUS

PDF

88.4 KB Created: 2021-07-20 21:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e9d791e796cd088d17a92ff3d376912 SHA-1: bd74d76832087e2b343f432891a8535c87f4d5f1 SHA-256: 74fa1f691166c83b1621361d86fb2a6b80bc3a8c18ea518f66aee61b60aa7f1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS upload directories. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://dighakanchaninternational.com/FCKeditor/file/82937500296.pdf In PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8af55cdc5b---41193805708.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/3c9d3629c82c61b13f12a3df5aa4277e/dalemakoxewutodesado.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bb27c791e---57754921734.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d585c03d7b7---22247200812.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/62661424999.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/bubazima.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90fa2730d3---89373094719.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/88208690302.pdfIn PDF document text
    • https://path.mn/userfiles/files/jidabojeb.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/9755698701.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609242073edb7---tazoxemuz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/cf243885c9501cedb69cba0aa9865b1a/visubadar.pdfIn PDF document text
    • https://polandpools.com/contents//files/kujudetufizaxaxumurabub.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/bafuja.pdfIn PDF document text
    • http://kpghomerepairs.com/uploads/image/files/97109966908.pdfIn PDF document text
    • https://signika.pl/Upload/file/baxelumuvij.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16099f786f2e90---sajinoterawix.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/77309569267.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/kojekoputerewetupegeto.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085c8be3ea38---63091541165.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/fcmj3jsp98frl5f1fbqcvn99dk/zediwuvoxeteduze.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc03977d8f2---82943542707.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef3cbd196b---41735178040.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f67ddca57---56817760484.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/jpssb41j2verpspt2g7fp4nlnd/bisesegawenajologuvu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=watch+hollywood+dirt+online+freePDF 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_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 18112 bytes
SHA-256: 36ff5fca8df5cc3c137c610ee693d2c22ed667a8302218ff63cd182f74e2f1bb
font_01_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 10596 bytes
SHA-256: 4d625a6b7dc7f590cbf3e57266ba0a5e95cf0981cf4bfa6234605440a96e8c6c
font_02_sfnt_off00013a77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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