Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6a5d9ae1e3aa2a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-02 16:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e07ab4868e51eb9c0892eb3922f77b2f SHA-1: 387e3fc624304ab885b5f4cd809dbe24143af910 SHA-256: 9f6a5d9ae1e3aa2a430637d546c62ac10520659f4816ad69aadec5734d7498dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jagamimpi.info/contents//files/pamirifuwokebani.pdf In PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/779d01926ebbcb297b25da77bea008a6/55745882653.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/5784551699.pdfIn PDF document text
    • http://chikatere.com/Upload/files/91352137395.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/161201b1769921---gitizodonufixiwodumebimej.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16128bc1246846---pagerufeboxuzuduw.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/22224576261.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/59020209950.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b604533a739---21670897468.pdfIn PDF document text
    • https://nadamasristorante.it/file/mibovubomatabad.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bexeb.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/34965133049.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/969699923.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/rinotur.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/377c1c82223084bcdc97e7542029d748/sanebojel.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/xufuzekalaxujumugo.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/kixorizaguwulolinijud.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/fitaxiwuri.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/me74gu6d30q56rk9na85t6tl57/45500007640.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/72215239539.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f484a123ac7---90804048798.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/54460399f47c58cc101bb4c290a59b46/92572180317.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45dbd90d1---44000318095.pdfIn PDF document text
    • https://equinox-e.com/upload/files/memujefatazubamakazeg.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/u7t198f948ek2ojf3s5lsf8kk2/biledizixodiridorosewug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=summer%27s+end+book+pdfPDF 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_off0000f576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8D 10704 bytes
SHA-256: 646dccfa15e251cc776f5dea0732d82037b513b02eb20a9f2733df6f10e2c08d
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 17920 bytes
SHA-256: c939b2fecb3fe4b8a7eef1202d92c6394c6403141c709e9df49b7664aef36dbc

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