Malicious PDF — malware analysis report

Static analysis result for SHA-256 239c864d1f1d4734…

MALICIOUS

PDF

74.6 KB Created: 2021-09-07 18:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fff5555be6b85f426407b618f66bf32b SHA-1: 806973774accfa0cca0f864b556521a90e239baf SHA-256: 239c864d1f1d4734a1619e5d2d60c1fb18f9c59277c5e6ab410184b881a34118
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs, many pointing to compromised websites or disposable domains, suggesting an intent to lure users to malicious content. The presence of multiple external URIs and link farm heuristics strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kristiankutschera.de/userfiles/file/17105791644.pdf
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/11123316603.pdf
    • http://dachastyle.com/userfiles/file/52253971176.pdf
    • http://brkvinc.com/userfiles/file/31711530728.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161011cb3c38ef---44153977261.pdf
    • http://bulmarconsult.com/files/93644440970.pdf
    • https://avenue102.com/uploads/file/nalazijuvemo.pdf
    • https://www.retake.dk/ckfinder/userfiles/files/kemusu.pdf
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles//files/51608041626.pdf
    • http://alconburyreunion.com/clients/36523/File/godekeful.pdf
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/17660977530.pdf
    • http://4seasonstours.in/userfiles/file/9470531571.pdf
    • http://mg001.cn/upload_fck/file/2021-5-6/20210506220807755964.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/99bed04231b765b1fa96304c4cf7afd9/mudijemu.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/5601d3c4271d7ba55ecdc13aeb43ac1a/43238369936.pdf
    • http://thecargonepal.com/userfiles/file/76520013969.pdf
    • http://tipiland.net/upload/file/46576126865.pdf
    • http://about-dogs.ru/upload/file/1040161504.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c853ce6d2---56333306215.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/53611029928.pdf
    • http://sofia-es.tokyo/yamituki-n/uploads/files/7157545842.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=tally+gst+full+notes+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_off0000bad8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 16792 bytes
font_01_sfnt_off0000d2ef.bin
bd6b6866c48673751cde7a907922503af6906ac39cb743420200696e9ac483a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2EF 10660 bytes
font_02_sfnt_off0000eb5d.bin
0a22f6520ce31436c6a94c26253233bcb0af862fbc72f2469a6647d611efde9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5D 19360 bytes

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