Malicious PDF — malware analysis report

Static analysis result for SHA-256 d209b8ddba67802a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-16 22:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e34361754624dece3659e945354cca3c SHA-1: b41bb83e3d79180d10f546e5fef35ab813677475 SHA-256: d209b8ddba67802a33862f6cb1ac9ca7aea570ab7307f06aedfecbce65ea9856
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, with several hosted on compromised CMS platforms. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to potentially malicious websites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17053478004.pdf In PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/81012194669.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/5359133909.pdfIn PDF document text
    • http://kleinschadenexperte.de/userfiles/file/29146183469.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/46744678727.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/raleladawewavepapa.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/89063190569.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1893be0e2---sixig.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/ranugi.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/55188443027.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/55642327056.pdfIn PDF document text
    • http://drigungkagyurinchenpalbarling.org/upload/userfiles/files/kumakenanaputigo.pdfIn PDF document text
    • http://husplaza.hu/editor_up/reminowoweviva.pdfIn PDF document text
    • http://aptekadc.pl/userfiles/userfile/21499892318.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/60018901047.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/rerakivewiviguk.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/49762332793.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1614130cf047e4---xoxufefapumubepobodosobi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/2888db2ff88bf6655089ef6fd5a6d737/vegukola.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/96437042940.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/75598472091.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/60923455114.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/34401785952.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=blur+video+background+androidPDF 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_off0000d64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64D 10728 bytes
SHA-256: 48d29bc4cf4134395a255e41d82d05daeaa4997d818bbc390db3c5582a8e7b10
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 17532 bytes
SHA-256: c20f0765c3d0d1abc2f80d20eab73519f97fdcd37241b91e6e94b4a1abda1b24
font_02_sfnt_off00011ca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1