Malicious PDF — malware analysis report

Static analysis result for SHA-256 2842fd1f6dcea736…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 19:38:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7af54d9ea8787f96b6f508ed092b4092 SHA-1: a1ea6da8cc98d8ff870596537d026148869f4231 SHA-256: 2842fd1f6dcea7364d18bc7688986a267d130a985d5bbd6287624a6cb621f44a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Several heuristics identified the PDF as a link farm, pointing to compromised WordPress sites and disposable hosting, with URLs containing 'utm_term' parameters suggesting phishing or SEO manipulation. The document body was heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL targets strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://philabc.ru/uplcv?utm_term=samsung+galaxy+note+gt+n7000+price+in+pakistan PDF link annotation
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613692e785d92---71439737361.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8fp29afn468355d8k3bbflt8n4/87880307638.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/82659023710.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/5100762346.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a13cf1ab64---10899053591.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/60185679377.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/vafunepogorujoresenefokew.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/punudutugidewumopuk.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/ralaluwixij.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/49602081876.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/janubexemaxugufebef.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/boliforijig.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/72683210012.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/50958028034.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/kajozovabu.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090414195070554.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050923186112.pdfIn PDF document text
    • http://topstec.com/d/files/masuxaxasijosavesatalok.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/17179660034.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/35235427186.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/tulededik.pdfIn PDF document text
    • http://elsped.hu/files/file/kukoleluvirawipekig.pdfIn PDF document text
    • https://bloomeng.com/uploads/zimuzijuji.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/59171935594.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_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 11372 bytes
SHA-256: 40c247ca626ac61807dd1640024a2952b99473e83d68c64ea8114740576243a0
font_01_sfnt_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 18460 bytes
SHA-256: b7034b68428b6f5e1ad34ea8f1f06b47d218226915fa944a82640a4af8e5c0a0

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