Malicious PDF — malware analysis report

Static analysis result for SHA-256 538e223442a645dc…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 19:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e2d0065ebd9224dea38ceecfa96f868 SHA-1: a82cbace28c84333ac956638f6617894299aa18b SHA-256: 538e223442a645dcc115d1280c52542dc2cfc22b8c8d359605a18e27de489e8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to lure users to external sites. While no scripts were explicitly extracted, the nature of the URLs and the detection names strongly suggest a phishing or malware distribution 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 http://cableesmaltado.com/d/files/34246339356.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409e47170fc---7908094346.pdf
    • https://bloomlight.pl/_bloom/file/97660309482.pdf
    • http://www.binghan.my/userfiles/file/97080005122.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f516227a26---28081541720.pdf
    • http://prinsart.ro/uploads/files/komazidivinulit.pdf
    • http://cachnhietwin.com/luutru/files/61771656575.pdf
    • http://baigeleather.com/userfiles/file/20074605731.pdf
    • http://2rent.gr/userfiles/file/xobirosagale.pdf
    • http://katour.ru/admin/ckfinder/userfiles/files/roniw.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148946dab469---vuwitaweb.pdf
    • http://ahchala.com/img/file/wogidinupidokokefom.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/a2f823c042d375f94691ac84978eda4d/4567760237.pdf
    • http://getsolarnj.com/userfiles/file/14635226516.pdf
    • http://85560891.com/upfolder/e/files/20210921095627.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/6993418841.pdf
    • http://zehanbiopharma.com/upload/files/witamoludovuv.pdf
    • http://grupposcorcia.it/userfiles/files/42937944186.pdf
    • http://ancient-theater.gr/media/file/12406078239.pdf
    • https://jotekonybakterium.hu/userfiles/files/16306853342.pdf
    • http://www.awakohchang.com/image/upload/File/3607633864.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613723ff3c35d---jirutazo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=install+app+on+android+tv+from+usb
    • 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_off0000aebd.bin
a8d001aafd65844f749cd24805eb70966ce61b3b6dcb56e5392913135e3697a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBD 17072 bytes
font_01_sfnt_off0000da09.bin
9108a379e689a69eef9c5cd6ee8c1e5ccc2021211aaa02c93958e79ecd0d1f9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 10784 bytes
font_02_sfnt_off0000f2a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A4 16792 bytes