Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf18343c353a3f1…

MALICIOUS

PDF

76.7 KB Created: 2021-09-04 07:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f8605be19a1b688d54a4351483efad47 SHA-1: 7daecbd6944fcb377dfb53c8594db5c6ee7a397c SHA-256: 4cf18343c353a3f16acb78e0bd65196c158944655dc82275cd8c3c3f8b1858b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to compromised or malicious websites. The presence of 'utm_term' in URLs further supports a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://medvor.ru/uplcv?utm_term=mercedes+e200+manual PDF link annotation
    • https://vydavatelstvoklett.sk/userfiles/file/dumatisuse.pdfIn PDF document text
    • http://parquessolaresdenavarra.com/userfiles/files/59604209977.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/pesetenamegimaku.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/31141626653.pdfIn PDF document text
    • http://standdominica.org/files/files/86382447527.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3c2d1158e---43790412044.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cabf3ce8b1---gubusepekax.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/nuradili.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/52928610284.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vupopij.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/80a728b0ca1f64ee949fc817f3bb703a/23955890496.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/59568775934.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/goxaromuduvuwunapefefiwig.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/49a742d8df1c17993a8863b47c6f5a13/suwadakamod.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/2tsoo9v4pevdbc1pnamvu8hnoe/90163932337.pdfIn PDF document text
    • http://altus.pl/userfiles/file/tipalelasawobaxogofomitok.pdfIn PDF document text
    • http://inphilong.com/upload/files/76601909913.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/31319522281.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021072619502173499.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a64e09c09---fijas.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5b7b7634a---76327789349.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4602679e3---tepeduzedoxop.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_off0000c806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC806 10556 bytes
SHA-256: c7f9343b8ec532cf12c4180b124fdc65ab472b2aeaaa92a36dc1550a347e4249
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF838 17356 bytes
SHA-256: 1c531af52c1ac367ac6d60fa99ab3ebe2101042764ecf144548c3511a6933199

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