Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbf88ad0bcd1249…

MALICIOUS

PDF

90.5 KB Created: 2021-06-26 18:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 0cd538ad67d68541feb5d8dd2242fc54 SHA-1: 54b9bf6f83c87541c0d17fcc66f8ea76f25e5b62 SHA-256: dcbf88ad0bcd1249f49beb2d0bf5110c3ac220a7411e3025291df28be814cb41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites, which likely serve as redirects for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to malicious external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/hjnpgls4si5f3rgok0bgccrt66/zedejifumukedumij.pdf In PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/545213168a8c2881df853cddc6e4f67d/jotisik.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/26ead765785e9946053ce4e3b88b64b8/mebaduzebozago.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774784dc5d---80952267736.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c73f22d5af---59262406511.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/54820551015.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8eb7ccc27ccc32048b36603069b9c2e1/jibaniwal.pdfIn PDF document text
    • http://altinay-law.com/images/file/12021431850.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/477c14eed8b7d52bdb9f07f788f24370/62182816376.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8a6d53ee1---48517080311.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/59395418371.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/fofitajovolojebixi.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/64485100933.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/bimarabexumoranex.pdfIn PDF document text
    • https://nasroglobal.com/userfiles/file/86512487906.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/taxupepolidanajotaga.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/30237f1858991a7db950af7e0d71f2f1/saxikajonuxiloto.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca68521a80---18603264394.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8183b9f55---nizobedutevuzakuza.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/6a4a2c164dd93d2ede1b36de039fcada/17589750712.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/fajozilel.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160815c7c36de5---nuxejozuser.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jineboruteresepomepid.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/mesivatusiditagovutikefa.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3il7fif1mvgof06anhuos30v03/xowenapivuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=serge+lang+first+course+in+calculus+pdfPDF 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_off0000fe8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8F 17296 bytes
SHA-256: c2f8e0c3fe31ad18bbc391e113b8bb03e28290cc27c6c707272a1730a5676bf6
font_01_sfnt_off00012b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2D 10972 bytes
SHA-256: a46ee13e49675f6a330f53f2a8a0caea91c17d1de3fa8d5840acf4904c005a72
font_02_sfnt_off0001448b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1448B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1