Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1226572bdad8c93…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 00:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 394073be00b6350c4b12cd7272248cf2 SHA-1: 9da1c771e1ebb0b71603b1d982772b27aa3868d3 SHA-256: a1226572bdad8c936ad624a83b04c1da30e6c9d22c3d050920f0275b50d1b7e0
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links to compromised websites, likely intended to host or redirect to malicious payloads. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading a secondary malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://medvor.ru/uplcv?utm_term=word+file+transfer+to+pdf+online PDF link annotation
    • https://svltv.in/userfiles/files/gifefazinitorikevotevenu.pdfIn PDF document text
    • http://bio86.fr/fichiers/seluruxenij.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8009ek4m97q1iijfmv4bqf7nud/kujeluligebizoxusajetoren.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607976be21191---fuselikuvixukobemurafiw.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0b75a344b9510d3330436e88368821a0/labam.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/xabup.pdfIn PDF document text
    • http://gdaniec.com/upload/files/89227583619.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fca81c5e03---64668969257.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4bf62565343636ac9a3fd9a1b2f5af1b/35207630819.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c81f2a4193ea60312c8a2ca83834b82/pimatamotizofifavibano.pdfIn PDF document text
    • http://hosvagyok.hu/userfiles/file/pejagapugasak.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/larivusasokulapero.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/34706357494.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210807064403_ook9ix.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/duzifabax.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621884244.pdfIn PDF document text
    • http://springhs1988.com/clients/a/a7/a70db2535ed58991dd9724faf9b165d0/File/defulemuvapalokemagejawu.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/84bf972e352ead9f9260ea65ec0aac4a/bexelulededuvalepejix.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/48940183731.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160853a305923f---zuginidobimuvokurufumej.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/46591333933.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/renivanojoxepulej.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_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 17400 bytes
SHA-256: 68bf871703b9767a7ab76f5e484ac76ab4770d4d1858567f2e663aeb1f79c631
font_01_sfnt_off0000ee94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AB 10484 bytes
SHA-256: e04c4a200b8730a306b96f4de99abf40d10e3bb34fbb3f3a98e2637a29fd4cd9

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