Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e163ec0ec70953a…

MALICIOUS

PDF

79.3 KB Created: 2021-09-07 15:11:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 24fe295d332bf0b04cd398beb6be6ff3 SHA-1: e6ebb0e7e394ab1b99ebde8c87837742ee3550e6 SHA-256: 8e163ec0ec70953ad30c6893c1739994f1a081eba22b04978bebd2503e9f761d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a malicious PDF detected by ClamAV and an ML classifier. It contains a link farm pointing to various websites, likely for phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting and use UTM parameters, suggesting a campaign to drive traffic to potentially malicious sites. No scripts were extracted, but the presence of numerous external URIs and the overall detection profile strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=pdf+reader+online+download PDF link annotation
    • http://pitchdecor-construction.com/user_img/files/68313523824.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdb5f9a29a---zexepuvajuvow.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/kf87m81uf4hu9n6f8b7s3okpad/lojutanowale.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/eafb9af6170aa4b1ef497a7ae6b44dce/debugerakojetafimuzaxijel.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a8713e5596f---nomisexilozojixudozin.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d52a5ebf---7978021596.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/52687368223.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/dikitaxavukuwofenefatu.pdfIn PDF document text
    • http://laserinnsbruck.com/static/45768111984.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e728952d---busowaxezugibinuv.pdfIn PDF document text
    • https://bushregenerators.info/userfiles/files/54788770985.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/60407913325.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/ae4ee14b8818386bb0901e7ad643d8d5/kalemumilorebos.pdfIn PDF document text
    • https://mimpidia.com/contents//files/jowofovi.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/dodiwufarawamigoboda.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16088a28e24a40---dabetisifoge.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/25586413783.pdfIn PDF document text
    • http://quetthe.com/upload/files/bisomi.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/08/files/210816100429.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/daxanekatifemotaru.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/demologimusopojokabatula.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 10168 bytes
SHA-256: 2400c137d27fdd7ffb240c9d194a3769a9de587423d02bad54e692f31aa1bd75
font_01_sfnt_off0000eb4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 17300 bytes
SHA-256: bf6531a04e3aab45d163b9b710885874c1d3a0a48ea46a1927a8583a1621f604

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