Malicious PDF — malware analysis report

Static analysis result for SHA-256 df463ca8c2e0de33…

MALICIOUS

PDF

84.8 KB Created: 2021-08-15 04:30:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d99172e741e9376df0aa7d3e52bdff85 SHA-1: cbf0f93055396df585b9b76349c86883835ebb13 SHA-256: df463ca8c2e0de335cb70d01f186138b06fcdd76eaecfadb6c72571ac74f3e7a
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised websites or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests an attempt to track user engagement, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=ejercicios+de+elasticidad+oferta+y+demanda+resueltos+pdf PDF link annotation
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/c10920d0207fc37a5fc5982778e691b3/vaxekixekiponajanu.pdfIn PDF document text
    • http://pi-consulting.ch/download/mumetuwewamowuxiso.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/sv11h2qdaft2srr70ig4ie1mh4/39642729955.pdfIn PDF document text
    • http://islandpointfl.com/userimages/35540625243.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/2a96e7808286d2916df306ca13bad54b/wofugel.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/4a2672c3e431631966c4ac6e959a0636/93808789764.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/9ec5668eaa799ca9039fa2225994e137/2752204723.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/taxedefus.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/9930d4e15d4ef53cb4c27d1e3db00d8c/96807146395.pdfIn PDF document text
    • https://avvocatoboretti.it/file/78285083003.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/8a8a942a1185400f9d039e1d2bb9abc7/87747827649.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/92068355139.pdfIn PDF document text
    • https://eternalbliss.net/file/36060257181.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/42921516924.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210806092414622.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/b76580ad3aead009508b404d4ca902cf/526718712.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5b8b1d063---ferizegizugifa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1619d7b1---37096827086.pdfIn PDF document text
    • https://mmszke.hu/files/file/77854049670.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/41559671719.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/talufafaberegupapon.pdfIn PDF document text
    • https://agatanorek.com/files/file/74853487978.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/kogun.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/000edb25940749f6ede34cabad5555ce/kokunurotunavitoparifosax.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/fimofobugi.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 16952 bytes
SHA-256: 210794eb408c440a12e2dbbe022d7cc803797f94e5c713804735daa0c9e6715f
font_01_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 11108 bytes
SHA-256: b95fcd0f159a71f11b16073bb8e1668f9112e0c6888fbf658b0c21ddef804d66
font_02_sfnt_off000129e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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