Malicious PDF — malware analysis report

Static analysis result for SHA-256 a650fa2b06f5bf04…

MALICIOUS

PDF

82.7 KB Created: 2021-09-15 00:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c491e878cccb462314ee160872d1f1bf SHA-1: df5b798056db1afc5638dbffd7cbfd964794b64d SHA-256: a650fa2b06f5bf04bce68ac70eac97b690fe1b8563358e64e61fa6b18ea73f41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to exploit users through deceptive redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://ccskin.com/geektic/files/golasisamabinaxanijita.pdf In PDF document text
    • http://ky-auto.com/uploadfile/files/nugopafogokujadifeporekiv.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130741a6963e---supuvaxiva.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133382eb15fa---tivubew.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/9j0t0u3m9sb88cmnnc4lmmsisj/96838910353.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/31249582229.pdfIn PDF document text
    • https://nexusmediation.nl/files/vivemopemado.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/timudujezeki.pdfIn PDF document text
    • http://ippon.lv/uploads/File/76211479215.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/xijoxaki.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee79eb882---8741713895.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/zapemiwuvimojis.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/bujegodipepugopu.pdfIn PDF document text
    • https://clickbox.ro/images/file/27901131057.pdfIn PDF document text
    • https://singlespeed-switzerland.ch/userfiles/files/33958391007.pdfIn PDF document text
    • https://koratspring.com/upload/file/62877865622.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/5743918896.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/benowedexisukotov.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/dilufegaximipabenuri.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36453029079.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/37094127753.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405300743a2---68137526438.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+download+live+net+tv+appPDF 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_off0000df0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0A 18260 bytes
SHA-256: f8d3722edf6637074ad81621153b9a15296edf0b596db0f1b169a226535e0919
font_01_sfnt_off00010dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD1 10260 bytes
SHA-256: faa4c180a7a5bf0186453ddc631d40fd3698bf5258f6eed7c38009d4bd3cd288
font_02_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1