Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f7d5f7bfab9ec6…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 01:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 55163a2168bb7655c6102969ae6dd704 SHA-1: e1ed885d6ace265c2d9f1b7c6ca48ecb06f77952 SHA-256: 88f7d5f7bfab9ec67ed174fd88a8b5059350dcd1bc7bf1cf8513f5947c47cb2a
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hongpakthai.com/ckfinder/userfiles/files/nukazodokovejipawubuvanu.pdf In PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613647a27675e---79519676913.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/56753667798.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/tujimuzovowuvegurigeru.pdfIn PDF document text
    • https://businesslife.com/content/file/51700135106.pdfIn PDF document text
    • https://rentcar888.com/uploads/files/202109020913405962.pdfIn PDF document text
    • https://foundlight.ca/home/foun6192/public_html/files/custom_files/file/32188831226.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/26088141763.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/57049068192.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/99050528376.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210909061732_562389841.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/84501660099.pdfIn PDF document text
    • https://pellevah.com/upload/files/74032469856.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16134094d60deb---37675320675.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/vulakinugujawemegemikinu.pdfIn PDF document text
    • http://pololanna.com/user_img/files/67967353416.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/35692750956.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/51524460494.pdfIn PDF document text
    • https://network-italia.com/file/tuxazukaxoju.pdfIn PDF document text
    • http://rideco.hu/upload/file/domavapanebofatu.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133234eaeefe---65144478630.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/25191790323.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/pilasejoliguta.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/wikudanugubisa.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/ziripavedifinixezabotati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=the+walking+dead+season+6+torrent+magnetPDF 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_off0000e838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001004a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1004A 18360 bytes
SHA-256: 7d358edb9492d8504c227b877f387cd5bbe65715e229848f40bbea18807f367c
font_02_sfnt_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 11004 bytes
SHA-256: 8ec50accc61a21a9368c5561e828b7afd23ca7be6993303d07d85be94057bc5f

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