Malicious PDF — malware analysis report

Static analysis result for SHA-256 171d45d5e5ba46d7…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 08:03:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7dd4587106a157656cd6ce924e1e4f6a SHA-1: cc4bea531031ec2681faada15ff235c5d3423c26 SHA-256: 171d45d5e5ba46d715ce41c0c4b1bb763de9d4eea1a4ab45c2f818899fa96c32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish for information. The presence of external URI links and link farm heuristics strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://medvor.ru/uplcv?utm_term=jake+paul+vs+ben+askren+live+stream PDF link annotation
    • http://moyamoya.center/images/hand_uploaded/files/keguwimemadokumopo.pdfIn PDF document text
    • http://njchemland.com/upload/files/58459276068.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/10918276558.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/faxosoxegumiwuwakofugowi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdc840944---20525152401.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1dfc5a168---lagifek.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_151425.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/77270241070.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/37199402874.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/39510793502.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8252632955.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/28508785823.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f97ba56494---96793100861.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wenabebajotunofokixagule.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161358ba26aa4f---bokofu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/kgauje3sqi3ri16c9oqkdgpei5/14156444605.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/bigisumefene.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/56151164808.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/tenigetodadup.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/xikoditekezudedepu.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/82382463482.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/19714150138.pdfIn PDF document text
    • http://maidichike.com/upload/files/davirafipozex.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/6445111752.pdfIn PDF document text
    • http://ph-easycome.com/userfiles/file/pedonozomap.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_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 19160 bytes
SHA-256: f030e44d02ee33f836a4b1949b2dcada08922548e0830567aeb277c45accc28b
font_01_sfnt_off0001128d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA4 10680 bytes
SHA-256: ba0e12d7dee1e1090fa555bec79403d7b66661002c5021bdd81895f1047c4860

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