Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e33fc6111750dd…

MALICIOUS

PDF

89.2 KB Created: 2021-08-13 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fd147e40faab7178caef95170ac05089 SHA-1: 75f4e473d36416fe02712d1c97f2b36223a82d49 SHA-256: b2e33fc6111750dde51e5b809b687fa8e65c4721f24640a1b04ca4410f530371
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://pistant.ru/uplcv?utm_term=guia+taller+de+capacitacion+hacia+una+nueva+escuela+mexicana+pdf PDF link annotation
    • http://pajurioverslas.lt/ckfinder/userfiles/files/pexitozedina.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/zesokabo.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/wifivopege.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccae01ca67---sapun.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/13639583769.pdfIn PDF document text
    • https://arendic.cl/files/57344775967.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/gipobotolujo.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608442564ba0d---51908223822.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/vukize.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6124b81de1---28853340577.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c46c1836189---sowapisekuxipazudese.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817f7e2d028---43825315830.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f1f8633951f---59908352834.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/63640910799.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/kijijan.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/govepeta.pdfIn PDF document text
    • http://abwva.com/uploads/files/89623087069.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c1e0370f1---jikofidiragop.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/razebenerututukelijikom.pdfIn PDF document text
    • https://xn--faade-mtal-p6a3a.ch/ckfinder/userfiles/files/56084416747.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/femisipijunokisawazu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68B 11192 bytes
SHA-256: c71e2287310373726aa8cec1cf61a7e06abab241ab495a25a023324979083275
font_02_sfnt_off0001108d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108D 17884 bytes
SHA-256: 09ff68eb190a83f32e29f93f4f4df757684393576713cd4feb87cfd955ad6af0
font_03_sfnt_off00013e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E08 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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