Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9ab5ba5cf8e0a0…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 15:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 434ff3fe26071edbea789f985463ae89 SHA-1: d9e676f47448a9385a0922bbf1e935b92b7a063b SHA-256: 5d9ab5ba5cf8e0a073129b56fac8592cdd80ae828815d42757bd59fef2a3b6b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various external websites, many of which are hosted on disposable domains or compromised WordPress installations. The presence of 'utm_term' parameters in some URLs suggests a phishing or tracking campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://allytemp.ru/uplcv?utm_term=live+background+windows+10
    • https://opescom-store.com/uploads/FCK_files/file/rulev.pdf
    • https://morethancars.eu/uploads/edytor/file/51052897419.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614093c3a234a---23384815291.pdf
    • http://assotechne.eu/userfiles/files/37098248586.pdf
    • http://www.louisianarebarcontractor.com/editorimg/file/zamuwox.pdf
    • http://emachn.com/data/attachment/file/28745366527.pdf
    • http://billsky.ee/files/file/48347955850.pdf
    • http://iwayman.com/uploadfiles/file/210905000001627309tsml86.pdf
    • http://koreanhotpot.com/uploads/files/miguj.pdf
    • http://kk-gorenjska.si/uporabnik/file/kedovije.pdf
    • http://asorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/83908534170.pdf
    • http://honeystraw.com/uploadfiles/file/vuzapevuwupoxaguxi.pdf
    • http://ainut.fi/userfiles/file/vuladut.pdf
    • https://makojudo.pl/zdjecia/fck/file/56271028784.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/aa0587a80952d474e51d5fb46853791e/74258263826.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/s919nstb6vai6hmaf6mljp1rs9/11023113481.pdf
    • http://ecohort.com/userfiles/files/45750478495.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/xexegifejabebofawozole.pdf
    • http://studiotecnicoarduini.eu/userfiles/files/wizuxuzekubufonabokuzore.pdf
    • http://henca.com/files/details/file/kizazed.pdf
    • http://gomientrung.vn/uploads/image/files/lanuxorip.pdf
    • http://idroter.org/userfiles/files/movilevujiko.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aecc.bin
9b128fde0378e5f1a00c5b546131b92cfb13e1feae9df07788204550f4854bed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAECC 11016 bytes
font_01_sfnt_off0000c872.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC872 16792 bytes
font_02_sfnt_off0000e084.bin
4c9aee692b81f113985907e7669c8a0b1efc220c8958a424aee75de5e93dd70e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE084 17608 bytes

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