Malicious PDF — malware analysis report

Static analysis result for SHA-256 8198162f20735aeb…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 08:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f4e11c830149edf959cd7114c774ef98 SHA-1: 1b4d90d2770c9593e121912277b61b82b58ac47a SHA-256: 8198162f20735aeb45c190455bf261e979844019c5257602c2ebc991b8773acc
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The document body is heavily obfuscated and unreadable, providing no further context on its specific purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://axwelindia.com/uploads/tozopumotimujesagegif.pdf In PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/kogutirumorutuwidipogu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jobuludawugaderuvi.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/puzoluri.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/ravuvonexukuw.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/tenetofotimobinub.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/miraxopidamuxu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/wumuga.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/26062583635.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/40c62d433ff09694398f99b4b1b6ffd9/bomoninutatapetun.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/sawidawazupi.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/36417001061.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/82465359703.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/52482908223.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/vetidixo.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ff131f3fd3fc35ca5c4e28fabacb9672/87078929121.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f32fbc5e8---126234558.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/49ca578df1b85c75d1ea32ae6fac256e/xivilajidufamipilas.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a02fddda85---kimofukoxomek.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/93786779957.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/35132388574.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ed4f298a09c91cb60ece9d9ca5854247/jiwekefolusunowuvizejarub.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/46894089493.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0249e874a---23293245920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=brastemp+ative+frost+free+manualPDF 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_off0000de43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE43 10736 bytes
SHA-256: a083dcd13f9d44c19b4a6cce5983399c3d56c5ab2b9ebada3f8c62fead87f467
font_01_sfnt_off0000f700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF700 18272 bytes
SHA-256: e874d7e38c1e144fab3d36ba89f96444af64ad36565ebaa485e6a1032fd274c3
font_02_sfnt_off00012725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1