Malicious PDF — malware analysis report

Static analysis result for SHA-256 39796c608530d6cc…

MALICIOUS

PDF

111.5 KB Created: 2021-07-26 15:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c71c7688a4759444afda62c8ac93a6ad SHA-1: ea48120cf3c860df23da2ce3f102de1de40b31db SHA-256: 39796c608530d6cc933527a1fc539094ff966b2e4f420068821987e0ddbb5006
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://aslimitada.com/userfiles/file/38565119830.pdf In PDF document text
    • http://feldbach-tourismus.at/files/kufogisa.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/39790750186.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/9339042843.pdfIn PDF document text
    • https://onelineservice.it/file/lijorufetabokudanasub.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ochpplc5ea32nj7psdcs0q4e5n/kugemevewomofuwi.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/86314940389.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a061697dd71---89686321660.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/3657827974.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/komedas.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c56664d83---83588323413.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/viponeped.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a9f179ba0---42495347391.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/2h33hq16ehgiqqe1k3k8t8f4m5/xugeboworimekilif.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/1122ddde61829e947cc34e3324608cec/88206952109.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609129f6cb179---57736447871.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160703cb18f4a3---regubetitirof.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/nawafogej.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16091ac4e67f81---41744219370.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/wowidawonasuwejavunupalo.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/88072721522.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607592b0e0d20---gokakosulafav.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/6f47f00d35fb8ec5ee293b52714019f1/6625972662.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8a296db75---88856568803.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pathfinder+2e+wizard+spell+listPDF 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_off00014f2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16741 10744 bytes
SHA-256: a47ee22131b633d4dbdbe57b89df81ac7548836e77765bc6620ce650776ee874
font_02_sfnt_off00018001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18001 18084 bytes
SHA-256: b3f748e54bf976269811742bde3938154c3292906688ae8ddad172d1c4bff96a

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