Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8f1e85047f6e47…

MALICIOUS

PDF

72.1 KB Created: 2021-09-18 05:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ae9d9e058913b8685697b6763f449aac SHA-1: db97845eb40d9105ccaefe8de912cb2b0fec3dfe SHA-256: fe8f1e85047f6e4728a72ec21fa018df77f398314252d9dda8142336aab51bbe
176 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, with many external URIs pointing to various domains, including compromised CMS uploads and disposable hosting. The embedded URLs suggest a phishing or malware distribution scheme, likely relying on users clicking through to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=check+symbol+in+word+copy+paste PDF link annotation
    • http://evevoyance.fr/adh/.-/file/puzapuvaposaxutajozilofa.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/tijukuretumukoxa.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/tetidinokas.pdfIn PDF document text
    • https://fond.ru/userfiles/file/11044014631.pdfIn PDF document text
    • http://jfe.hk/userfiles/lukoxaxida.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/zirugam.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/pojizumuroxutadadenuliza.pdfIn PDF document text
    • http://140.121.161.111/ckfinder/userfiles/files/kozijokibojelutejugufujok.pdfPDF link annotation
    • https://ski-valloire.com/ckfinder/userfiles/files/jemisu.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lerevesodasugupenowas.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///rufebavuvafupovutejojoza.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143ded8e4b65---gowovulozowunenelujoravo.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/92423604989.pdfIn PDF document text
    • https://sharenkon.com/files/zeduduwaxudidasu.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/zomozegatagup.pdfIn PDF document text
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/busamepewexi.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161370af67214e---xekadadagago.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/1bd2f3690f05f9e493340cddb1a029fd/50236792570.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/pifanewifog.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/dujafusofebisu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed060ea959---pumuladefabisuj.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_off0000b4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD03 17472 bytes
SHA-256: ca34c069e716dd3a51be8bb7197aaf07002fb8858e00edf6dccee8f4c166f83f
font_02_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 11240 bytes
SHA-256: f806bc193e69237717f64b7b16e9b51282f10b0d73c06060a626c8d699f7a55d

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