Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47ed8fb2efbf6b2…

MALICIOUS

PDF

77.5 KB Created: 2021-09-03 00:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a5353433c4a8f15a4541f09a8905e75c SHA-1: 3f33c77eda6de7973a8f5b7033130893db865e84 SHA-256: d47ed8fb2efbf6b254e326d71415b3aa1010fd68a8218bc45baf3f9ce2a69c3d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic. No scripts were extracted, but the overall structure and URL distribution strongly suggest a malicious intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://drafthe.ru/uplcv?utm_term=active+directory+pdf+book PDF link annotation
    • https://feldmann-spedition.de/pics/userfiles/file/momilagugavoneko.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160989f0a8e39b---vewusogagiwevavanu.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///50856002193.pdfIn PDF document text
    • http://tp-pos.com/uploads/image/files/51242169545.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/14338572763.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/97689388782.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/r2ucq7m8v79rg3kqqg8sp4pjp2/68386183201.pdfIn PDF document text
    • http://eichler-kammerer.de/27536270702.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82f1eab0ca---56755674974.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/1244844361.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/17369095399.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806fd408efa---tefomomitubunisele.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/2252418796.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/guxoludawabuzejijowitelot.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/32057987384.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a84806ec0f1---loberiwekitog.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/5210355550.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/pivejobul.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072f8057c15a---jududaxibimalen.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/6ocdle0dc3irh8lhhgdl7605s4/dulejezadigeze.pdfIn PDF document text
    • http://funperm.ru/content/file/niwefaxiwe.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/23905153587.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/92624357759.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050300503098.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51cfbc1c8---nenaretidadumoguwu.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/18083777383.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/79124705233.pdfIn PDF document text
    • https://85097781.com/upload/files/teterik.pdfIn PDF document text
    • 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 10528 bytes
SHA-256: 9f4c07109c67eb6d6a26adf9fab687aee1af3765fe0177c65bf3273077b1a9f4
font_01_sfnt_off0000e428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3A 16928 bytes
SHA-256: f0032fbd260a86c151c3b8eb66fee4286c31607118e568b5dc2bf2bea5d43c34

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