Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7687924199b38b5…

MALICIOUS

PDF

114.2 KB Created: 2021-06-25 19:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd3609f3d6042ad2ebc741c270da90ad SHA-1: 46368896da83bd9e59a010e950ae2ceecf1a27be SHA-256: f7687924199b38b5c28e0ac24e920e783859f882d2392d858ef34c5608d07b46
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns suggest a malicious document intended to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e054fb5d42---jukekitawopesova.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e5086674f---77414506394.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/6419aabf1ae4f016a96ab468129988f6/94848819136.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c49f261c---dobusetulisezonogugapow.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608e212b4ca50---tajazetodigulelekokata.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021052510000988.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210528194926.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/20394494263.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160747b977f854---wubunulala.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/da569b71094d83828a15ca1e012d141e/faxolijadopolazejuvuro.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/be4ecd6c47492f62056fdbfe00611ed2/62987809441.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607b77aca030e---68553600346.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608775d913837---71202697599.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/e9fdg5is692l3i0co9tkib1k01/29844895502.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160848c1a3994b---9021625429.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/8ed1a015a4835ef29726e5116328ed9b/67930974566.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/52293373452.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/kepuk.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/73720890047.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2e7af80e---37586179578.pdfIn PDF document text
    • http://blueyee.com/upload/file/180647486956.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/1e3b2a0a0be08cadd1282e967f56c24d/wazamuxobamezufadivofoz.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/gamujajevijanuzupon.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/0f19e82502b1e3483e4e6143940a9818/zijowuzikesivenejawufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=waters+acquity+sample+manager+manualPDF 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_off00015d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D20 17376 bytes
SHA-256: a27e3edeff32f6b7cd6ba8e2d2b6954978992950a7c95bd536033670c7b9ef76
font_01_sfnt_off00018a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A13 10952 bytes
SHA-256: 3a4c1a2edb90770274d2fc2b3428bc01be53dabb788978938090cbbb9eca87c4
font_02_sfnt_off0001a329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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