Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8448a400f76932…

MALICIOUS

PDF

69.5 KB Created: 2021-08-30 20:04:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c6b7aa0c079e2a401eb913e7cc10670 SHA-1: e9d0cbf39db439ae01e3f2d0930e9d15f579d94b SHA-256: 1a8448a400f7693278ef056b1c443e9220cabe3aad1c47207a3562e858b5b475
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size, image-only appearance, and embedded clickable links. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot is used to hide an action trigger. Multiple URLs hosted on compromised CMS platforms and disposable hosting were extracted, suggesting a link farm designed to redirect users. Although no scripts were directly extracted, the nature of the PDF and its embedded links strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://alde-pace.org/ckfinder/userfiles/files/xikileruropife.pdf In PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16120a4c8d711f---mumomosasoxeso.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/4cnn479hfhf1s9jatll7bgvbm4/mepikumitiginuvotafixegi.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/e93ea811392f5b1eee142b9b31803b0c/suberepipigunafedo.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/8v6aprlvq0h6c8nmig315aihne/97487577024.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57122f00e2---fetulopagiratuvekonen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc59ec5315---fagudabadojapesunivo.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/31667137283.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210818_C278800E6D5A292D.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1606d334c4bc2d---20194726312.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/jidogivokukivitutax.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/63552246636.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202161631237.pdfIn PDF document text
    • http://charontrade.hu/data/file/19815411660.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/0mmort9ael3htqi5g5vlm3b5tv/67596129803.pdfIn PDF document text
    • https://viettrungson.com/media//Files/6319074707.pdfIn PDF document text
    • http://skupka54.ru/upload/m/logujonuluwewov.pdfIn PDF document text
    • https://akconta.com/uploads/files/sapewalenupiwigawefub.pdfIn PDF document text
    • http://debten.net/UserFiles/File/79239119074.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/xejazezuvazizegol.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/bipirasobu.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/25243131753.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/ea56def846738274731280bf682a965e/31084509537.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/86bb136fca145ddac99902ef2df02afc/87705978791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=soulstone+minecraft+mystical+agriculturePDF 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 10968 bytes
SHA-256: 1a3c9be43a409025dacf0d0f9c48ce3147a0f82905f70c2c09129d9e9d243621
font_01_sfnt_off0000cb11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE323 14056 bytes
SHA-256: c83edf00b9837bd01a5e9d231249ae2eb267c62a8f14c5872e849204c17bc629

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