Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d4b74e90a426f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-03 15:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d55d37d1988af55c55874b07b93dd7fd SHA-1: 4a0358ce527e278cb32bd1bb9b758eef4a07d3c2 SHA-256: c51d4b74e90a426fd96d7954c07e054c038334e0cf490da9d9b3bf17c74f8d3b
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or malware distribution scheme. The document's structure and embedded URLs suggest it is intended to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=the+human+voice+2020
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/609566f6d8b23845db2cdb930dd81800/dedimamibikedifoge.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/dbdbd0a6894ed012cc3953a554ba1c4f/49921066042.pdf
    • https://telewebmarketing.com/FCKeditor/file/noganamufuke.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e06fde8461657f156ec69179ad3484b2/diruxizozuno.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/10683ff8cda9d60a475fe74d4a8d703c/tipudalokinesogube.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/58c8oumu8i8j0m60cmh2huftoc/kubebukikirod.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa67cf6f0a0---65661477298.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f60b4d42ce---69617488716.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/jkhh50sjo6b0lp0t5q2rljq8jm/kulimitasubikivekozagedal.pdf
    • http://delve-cr.com/uploads/37909201318.pdf
    • https://sportsht.com/userfiles/file/pusufudaroxajomupoj.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/e6vvknia8253ifosg1a692gcvp/nomilizobazi.pdf
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/sp1bru0otgvhnrca58upa9oru5/gikuripi.pdf
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/64159773039.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/85f1dd6ae15d608a55bdc0611ac99e3a/81040183473.pdf
    • https://medtek.vn/storage/file/19262971132.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/9a5f4bc73e360d89ff223e1781acbf61/megirodezozoxaroxowuv.pdf
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/penoxepopinebukawopunow.pdf
    • https://namdolove.com/FileData/ckfinder/files/20210605_E8B76DD3A15C2F37.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070a849c37b8---gupexenunudefotodafum.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/6evokn8h29ns1eqtk0ar8o9795/14984844899.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2b10856bc6b809606d2af0f593c3edb2/kesizomotaruguj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010654.bin
a62e7a07cf6fc1fa84e24048a3bfca9fdd5aab4c38d79570de6aae69ff92968e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10452 bytes
font_01_sfnt_off00011dec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEC 16792 bytes
font_02_sfnt_off000135fe.bin
10716eccece053731ac2f0f8acfc207cc9cdc400fee2872fd5c015c473998bee
pdf-font-stream PDF embedded font (sfnt) at offset 0x135FE 17856 bytes