Malicious PDF — malware analysis report

Static analysis result for SHA-256 53216365c17736eb…

MALICIOUS

PDF

83.0 KB Created: 2021-09-13 13:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4986653a868eb6bbc977eefb6148e871 SHA-1: 9981eb4ef0c5e4e9e5faabafbeba1ee7d282f348 SHA-256: 53216365c17736eb53afab93db0cf64371a4430d4b3eabb8e9afcfd75803fc47
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document detected as malicious by ML classifiers and ClamAV, exhibiting characteristics of a callback phishing lure. It contains numerous links to external websites, some hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content or gather information. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to deceive the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://pixomot.ru/uplcv?utm_term=app+to+turn+old+phone+into+camera PDF link annotation
    • http://www.florentmaussion.net/userfiles/File/gavenopunufej.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/widinakojejagexusuro.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/tetatetetigameroxozedat.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/vazopofoposibewes.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/gf4qaanhj8m2aam9jr29plev03/18156068446.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/34294798122.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/84425253361.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/95249799859.pdfIn PDF document text
    • http://e-hematologica.com/users/file/jizepepo.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/61160492886.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/7895300919.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bixuruvozaguken.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7aa09cefc---89082955363.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/74262350695.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/97515991062.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18459c8a2---vanenotikolan.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ad269a35a---72944945720.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb08d0b7a2---mafotuvafimaxofelowax.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/wogivivesonagogoberazagi.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3fcf3db3---86991119581.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210905175913991699.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/16616435464.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/ropojo.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f7170ce3---mudizamime.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/3067297394.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/papez.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_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10692 bytes
SHA-256: 9f05272282ea3df0be001611469b5b2b44bf9e7c18424db90ef747fc1d66275a
font_01_sfnt_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 17644 bytes
SHA-256: eb1491a017d962c15992d134bb5f976520878d1c2a4f14ad0125c694f0af14f6
font_02_sfnt_off000125fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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