Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d08953c331a0f8…

MALICIOUS

PDF

94.3 KB Created: 2021-06-26 15:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0147d35fdcae3f1c10c31d8c1b5dfb0b SHA-1: 79dc6244d2f360a8106525d71c7fe33a3e1e0b01 SHA-256: d9d08953c331a0f80877177f8fc78ce25b1327aef4a206e0b7c111d579bde097
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised CMS upload storage, with numerous distinct hosts and URLs pointing to PDF files. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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 http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75c2d9b46---68139147246.pdf In PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/40679f546e7c92fe16809ed0fa81a700/64538585302.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/zumezikexob.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/92886888997.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8f0b89f2dea7a87ac585d8fb8bf2cd45/10924775640.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/72734182255.pdfIn PDF document text
    • http://blueyee.com/upload/file/121233203598.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deec0af771---lubukiwadavajaxulodironi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afceed9cbe3---58944208715.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/vedeve.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083157f032e8---faxaz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071313253a1e---kotilifopomalun.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/74279792276.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c0937fe4bf2---92878028312.pdfIn PDF document text
    • https://alutat.com/data/file/ledorotarufekakobinagetu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790330674a7---zuxotupefolotawakix.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/55946240429.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/54812376325.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3da6cddd04.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf278e9d7d1---13957384259.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/mugawevetanuteraka.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/qihppn40ebvodqedie0tpo0ktl/rijobominejolerumakupov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=the+black+witch+series+orderPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF655 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_01_sfnt_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 10644 bytes
SHA-256: 010a7ed5215ea435fbd36a38172a8dd2c360acde57f780423ecff9de8eb1eb62
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 17480 bytes
SHA-256: 8ad3b256d10bf6f996a2ef403a310d97480002971dba510e9bec4ce918318bd3
font_03_sfnt_off000151d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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