Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bf9e90dd52da296…

MALICIOUS

PDF

108.9 KB Created: 2021-07-13 14:02:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3413b7f29c6743c594c77c27a29ef371 SHA-1: 58ac41c40b7ff814cfafb0f7a485d309880fa5e5 SHA-256: 9bf9e90dd52da2961ae07feab40a203f482ec16d779dc4c504a058e0e7fea00a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The primary attack pattern involves directing users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://vico-real-estate.com/ckfinder/userfiles/files/tutuzimujob.pdf In PDF document text
    • https://alnahamgroup.com/userfiles/file/51024894729.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3b9086031---tikiponizat.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a28f0db3---27137681911.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/33870266157.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d3323c69---82638304149.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fn69k67u6s1oupi2sg9u8rn2o7/zoruxokakun.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/3541911f3df746b2137549e70226ab28/vuwireno.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/22711398836.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/0nvc478vduvcoo61v03grl2pu8/71075256252.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac4d393440---dekitelisewemu.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608daaa5224fd---tibifefax.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/i4ms4s9ojcp5sujn66377nhreo/ruzadugekijamapu.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/sfjkaklnc8bfaaug1omq1u56hq/51252562963.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070804305673499.pdfIn PDF document text
    • http://dges.in/userfiles/file/xegazomo.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/82541961907.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/74103625079.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808fbe3c205---41295264814.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/afbc1c168c71e84ab70ddb1b3a56d33a/goxanerupejuleromese.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54b25da35b---38983166869.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/lumofomategokoxazajitevoz.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071a474701cc---liwezozed.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea5067cbc8---89548963228.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/117e130284adece56417ea6127b41573/mabonerebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+meaning+of+mendacityPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001134c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1134C 29612 bytes
SHA-256: 6e46f8cba6730b427eaf4e24176692681d770035e4833196efb75634d680e868
font_00_sfnt_off0000fb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001486a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486A 22196 bytes
SHA-256: 338bd664a8f209e6dcc24f218cbf97f2bc3a3d6c7d41e5ffd5450b8c047d9c50
font_03_sfnt_off00018160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18160 2760 bytes
SHA-256: c62384aaf83bcae232c1747047d9da6eb3ae3bc953490c38868ec8a77d5d3068
font_04_sfnt_off00018d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D33 10688 bytes
SHA-256: 7a03ce58880c7373f525748448056b6dd652828906840aaac10c60ec8477f514

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