Malicious PDF — malware analysis report

Static analysis result for SHA-256 342518c797063f7b…

MALICIOUS

PDF

79.5 KB Created: 2021-10-10 03:57:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6034d97fcf8a18e67d3b89e7e8bda066 SHA-1: dd928965aa92a5512931484e5ba25bd976f3a273 SHA-256: 342518c797063f7b0518da616454827fc8c212f73c17776fe05264d4c9435f59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=holes+chapter+questions+pdf PDF link annotation
    • https://s-serviss.lv/userfiles/file/kekekafupilusoseduduga.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/24003099021.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/danarerimawamenu.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/siraditasefoj.pdfIn PDF document text
    • https://granitnet.hu/editor_up/70890921622.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615b713dec919---bazakiwuzabazijezu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397032e3a7c---17652315499.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/2068867518.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/leropekadofifut.pdfIn PDF document text
    • http://haliburtonhighlandsheritage.ca/userfiles/file/fikodagujekexipi.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/sewokenegafa.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/sasiduzuriti.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/41997447673.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ccdd40c9a---56209926920.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159ca31d5165---31991233284.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/lobanigewe.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2ce3c2f9c5e44452123db072ae686f89/jawidivati.pdfIn PDF document text
    • http://lonniestireandauto.com/nbloom/fckuploads/file/35663616291.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613518cd5373a---lawulawisi.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebced8594d---65130903728.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/10748649779.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/a87e48fda69a7ea23371477ec89ff4ec/romebelafuke.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/70911532393.pdfIn PDF document text
    • 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_off0000c9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C1 20740 bytes
SHA-256: 53dfbaef64da03e009ed1c23bb4f04d1bbbc0e27f67c9f6b4a6d890bb2e904d4
font_01_sfnt_off0000ff2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11745 10952 bytes
SHA-256: b5da16ebbcd9109fdb5f358233c7086f821a9dd45d05d780086823479a8f8b08

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