Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2c3aba1be5f84b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 10:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac775bdd50d51e982080733737b180c7 SHA-1: b24624ea133e566a4054506d7029510c80fccb39 SHA-256: ad2c3aba1be5f84b21218c3ae6fa30ac854e5d58fd551424fbe3dc2c02e45e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the presence of a link farm on compromised or disposable hosting, with multiple URLs pointing to PDF files. While no scripts were extracted, the structure suggests an attempt to redirect users to malicious content, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcedd8550f---32730991803.pdf In PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/38075968487.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lelupanepotaseguzupelowoj.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/mavarozuk.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/legulupefufiriruz.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/vikabumododi.pdfIn PDF document text
    • http://imdmotors.com/uploadfile/file/2021090917200791.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210907_A23A7819D78A127F.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/soraluramokujuwa.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kudotelugiv.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/63313607617.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/berujuda.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/molumeloborurolakelop.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/17936172035.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/gematiwokubibatotofalub.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/doparerojenagetofo.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/37717259383.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kuxoguwapitalutap.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/54280d9d27dd8d463981eb2417b0f00d/19635853309.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/950001ol3rbq7o9ers72b8p993/besidetosin.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/35733319747.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/37238650505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=why+do+i+have+to+download+text+messages+on+androidPDF 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_off0000d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EC 17808 bytes
SHA-256: f9330d9f8d88dbec09ab7bc0a9c99e4c2e2efb341191e9e725ab9760272d30be
font_01_sfnt_off00010056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10056 11056 bytes
SHA-256: 439d3e5bb0c2d552604a79458e275e90b2d1e1c862429d0bdb23a2b266beed0f
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1