Malicious PDF — malware analysis report

Static analysis result for SHA-256 d532a590d596ebc5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-12 05:20:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 396ccd0ca8e7f12d04a5d559e787fcf4 SHA-1: bb69b9cc7533634231b917821bd062ff56d7aa97 SHA-256: d532a590d596ebc50fa9141c535d64a87faa34022156ed72c4cc815f829f6d2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://boilerservis.ru/uploads/files/49637873368.pdf
    • http://defhjdrjioo.friend-match.com/upload/files/gixevavogeluvupetuk.pdf
    • http://videofilm-tv.ru/content/File/53150195584.pdf
    • https://kirbas.com/img/uploaded/file/mezatetu.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc71fc407c---70188042429.pdf
    • http://puisan.ru/uploads/file/kafazagetir.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd4ebc386---4361579000.pdf
    • http://etkenkalip.com/files/vepumunusatam.pdf
    • http://dfwsedan.com/nbloom/fckuploads/file/pobamofiwexebem.pdf
    • https://agrimal.pl/userfiles/file/72282830684.pdf
    • http://aallergy.friend-match.com/upload/files/zuxawixok.pdf
    • http://greenlivinggarden.com/htdocs/UserFiles/file/13400572667.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/12b3684c3e37ecf414ddded35700891c/pafovukipetelumivifer.pdf
    • http://shahnawazonline.com/uploads/files/saneluvifedibisovuvi.pdf
    • http://cnpair.com/userfiles/file/sumujupanuvenaraxireb.pdf
    • https://snowcat.pl/admin/ckfinder/userfiles/files/4749804954.pdf
    • https://tch.lu/files/files/96846133929.pdf
    • http://bckbytow.naszbip.pl/img/upload/files/buzujepagokegifox.pdf
    • http://residencelesaline.it/userfiles/files/71188919215.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394f47e4969---zubamagufavofidaxuledi.pdf
    • http://kfnmdg.com/upfolder/e/files/20210912070650.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=android+phone+battery+drain+quickly
    • 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_off0000d5f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F8 16792 bytes
font_01_sfnt_off0000ee0a.bin
27a6666b6804c92daefc6702aa7f2cb9f308be584bea3e67138b33b18e709c39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0A 17492 bytes
font_02_sfnt_off00011b29.bin
fa93dba5989692e12018a976cf8be9302c6ccac055959c0f1feec73758aaef19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 11016 bytes

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