Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a4701a8d628f46…

MALICIOUS

PDF

102.6 KB Created: 2021-07-14 03:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c0919a39d6dd36f9416ea2b50ed9c156 SHA-1: b262e09601e8f157f63c531469a50ed2514ddba2 SHA-256: 05a4701a8d628f46f376bf2f02c91af358f38e57e1def781970b56292c1d96e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document functions as a link farm, directing users to numerous external websites. Several of these links point to compromised WordPress upload directories, indicating a potential distribution point for further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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 https://cructi.ru/uplcv?utm_term=sweet+pea+dentistry+parker PDF link annotation
    • http://skolicka.eu/foto/images/file/metikanuledevufiv.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/54532224255.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/46223996486.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3984fbed6ae053683bcb9202539c6fd1/kovitewopipigipewo.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/9a10bce05857250c8d4ebae2befa68c0/zufeberutaroguxinesi.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/29164547307.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/gugibutedalapemobijepo.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f3b72b70ee83510e25ac3dacedce92e0/66238304630.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/67028375203.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8b9d971c3---takiles.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/8917641781.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/a33a8809933e3c4e4dba9ac22baaa174/wetusapugom.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608446ed510f5---dunumameso.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84e77bfd41---naxuledilunolovadazafugo.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160758424b6009---zawexipowo.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7c42b061bd3a0359d201822d5037536d/varojixezanifoxisuxoxige.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1665651c81a3156748c4d1f80a32c9ba/40964394147.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/enojewodopigaw.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/59b52c246adf5fe5799cc66876fb4517/bikademalali.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/wewasukidoxixatam.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a341c9cd1b---63082353822.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8321475523.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/8c989b19a724e29c4153dd27e48972b9/rojewamubisizezus.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/turabelujotofojifena.pdfIn PDF document text
    • https://le27.fr/docs/file/4635941086.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e54953a5a633aff4e36c4481ec13fe11/kukefiwu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 17260 bytes
SHA-256: 62844bff77b675f77ebc22bdcd18bdebb42a982a8514ef0dad8205a409076bfd
font_01_sfnt_off0001469f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469F 10584 bytes
SHA-256: 0770ac1740759b6a0311641a9485127dabcde112c6143d9d05e62f341d3517d6
font_02_sfnt_off00015f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17712 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd