Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb1c8fbf6f7a6940…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 12:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: afb6284b3bb220bcaa11142e9743c53e SHA-1: 6ac81c0a1b12eac6874d572d174b0b1f7a8a2763 SHA-256: cb1c8fbf6f7a6940909947e18ad0647016582a5cf53321e303fb188e8399fbb3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to direct users to malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely provides password instructions for an archive, a common tactic to bypass gateway security. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pielinks.com/UserFiles/file/xatudegidawezarojaxor.pdf In PDF document text
    • http://nsdadventist.org/FCKData/file/gilabujuzofulupafufegisug.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/dozot.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/fc9b51e32343ef07654e5ab00713da9d/64135295645.pdfIn PDF document text
    • http://wmsone.com/eimages/file/vapiku.pdfIn PDF document text
    • http://wdnederland.nl/file/86285262347.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/setimumewikonulo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139059dcb95d---wiwemenaz.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/kodoned.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/baliwosakuvizufofitipupif.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/gakopogumeberap.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/050358a18549b8bebb362062ef6a7d05/84527852258.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/pu2dlidmgse3ktsm1fekd6d0s3/42242380224.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/sonori.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/17736812500.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/muwovivukugilatazeb.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109011102066163.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/rutimabixa.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/kivevirodafadiwolafi.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/68401f066e4af22e241a75771947be76/12143572304.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/58899423574.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/33876107127.pdfIn PDF document text
    • http://sictombbi.fr/ckfinder/userfiles/files/80661294886.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/462125043.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=gta+v+apk+download+filePDF 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_off0000d9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B7 18764 bytes
SHA-256: 2a2a9bcb666ee1dadb81c128f8cdf6823505367b32f79ffda4123d8553ba5454
font_02_sfnt_off000121a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A6 10508 bytes
SHA-256: 9d352fff4f3e3693ba668dae61c14a70c284b269d9a54f8c136aa6f9ca73a1aa

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