Malicious PDF — malware analysis report

Static analysis result for SHA-256 1685f96e4d144e45…

MALICIOUS

PDF

97.6 KB Created: 2021-09-02 08:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e6d7f71b49c4ec040d27f48721f7d36f SHA-1: e9d1d00560cfade44129fcdf637e52da762959f0 SHA-256: 1685f96e4d144e45b7c89de8e617fbbcd0682a1db609a27d34e78a10365f936e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to potentially harmful content. The embedded URLs, despite some being marked benign, are part of a larger pattern of hosting links on potentially compromised or disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afb36fe920a---42753371008.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088963b61a63---80438051601.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1rf5krsqfngk8ltoavrtte4131/jifagukugezujalopek.pdfIn PDF document text
    • http://philboyd.com/93493919938.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2c2552259---rexuvizavomumetivipuwun.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/jozabexakekawefuja.pdfIn PDF document text
    • http://a-pluset.com/userfiles/panatiz.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3d2015861---28788591943.pdfIn PDF document text
    • https://chp-travel.ir/data/file/68446777007.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/eeb35ad1365d3b8a6f050067235518d4/39957240997.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6cju96970iatb8aslg0nqu3dn3/24780391167.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/29154269422.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e91d164866f071977d203aae9bdca751/557459076.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/gotukonenefosusuvefurume.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mibawaditujeje.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210714_F106A05A0F018C3F.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/wadanapenutiba.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/bibesolokifas.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/97347904095.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6fec345ad---gurodu.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/aevo7ceog6mo5dv6q8vumetol8/teropax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=absolute+value+of+a+number+calculatorPDF 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_off0001184d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184D 18448 bytes
SHA-256: 6f8f21eb05f649af18f381a308c919a2e8266ea1fe443a8018cbedf79b71e914
font_01_sfnt_off00014824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14824 10692 bytes
SHA-256: 8326e6574b66c1b7858cfaad8ad6fc676660309a6e0eeb765a8ad2385b30d43c
font_02_sfnt_off000160c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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