Malicious PDF — malware analysis report

Static analysis result for SHA-256 a399b8632c5b8b62…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 86ceca748b958f5fbc23a0d96330fb92 SHA-1: 51b84bf101f319991393ecff66300a2e49e31a22 SHA-256: a399b8632c5b8b62320d7090248cbab9aabed0a157cbb7b84a71b7ea02b131b1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to external malicious sites.

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 https://garglob.ru/uplcv?utm_term=following+assistant+apk PDF link annotation
    • http://www.deep2001.com/images/library/File/23167600094.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/54452429963.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210911205121.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/32982992570.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/3285236696.pdfIn PDF document text
    • http://etspak.com/survey/userfiles/files/gesaronozanugol.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecbefe0893---pojejominukis.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/deviradijex.pdfIn PDF document text
    • https://rosycaffe.com/file/45897289007.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/71925398929.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146062766575---mejupupo.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/67797597829.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/zularefojoju.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/27890129574.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210904113009.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e3d50bb6d---fevijekilifo.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109140246183227.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/kelagemaje.pdfIn PDF document text
    • https://alternatifhirdavat.com/upload/ckfinder/files/maxokixasonipasez.pdfIn PDF document text
    • http://kd-council.com/upfile/files/85034115258.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/nafopulogov.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/milorifolisewixifaxafex.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/jodokipifejuwufaronaka.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/xerexi.pdfIn PDF document text
    • http://ebus.cn/up_file/file/xudibewiwexaxuvajapowele.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_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 17932 bytes
SHA-256: 24c561c58c8e2913f2a66fa36b9ecd6a9ced0bd08d606a1ba3ad4defd7517014
font_01_sfnt_off00010ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA9 10352 bytes
SHA-256: e3b96677ae990e78cc52de01f60f18dc90165f20b48f5be5301a832fb8f83ab2
font_02_sfnt_off00012639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12639 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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