Malicious PDF — malware analysis report

Static analysis result for SHA-256 073d256f8a26302b…

MALICIOUS

PDF

82.0 KB Created: 2021-08-31 04:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 726859e62961a58bff43508f078c722a SHA-1: 87dc188eaccaf169f03e16293524f1ff4ab46b85 SHA-256: 073d256f8a26302b2d592cc4b09f515d25465895a7270d818951a7e61d6611e6
156 Risk Score

Malware Insights

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

The PDF 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 compromised WordPress upload storage locations and disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/qt8bl33a8mq3m8j0ph80j5hss3/gakolezosal.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b11294490bc---jilikux.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b14c68898---66088266848.pdf
    • http://reicar.dk/userfiles/file/nelurupisezemajomeni.pdf
    • http://vdadanang.vn/app/webroot/assets/files/98659528348.pdf
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/38045423435.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9c2354cdaf23dbea8edf8f9e6894edd9/vakit.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/tsps1atcspgkjduanhr56ibpui/mebubibuwawowarosuxas.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160f19c90caa51---47875875856.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eace1c707a---81039928883.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c97bbb99---balis.pdf
    • https://camgloberealtor.com/userfiles/file/buzoxaged.pdf
    • https://sitpchemcieszyn.pl/_sitpchem/file/97503435388.pdf
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/37883079122.pdf
    • http://sunwisechem.com/Uploadfiles/files/sufilalifunesumilemu.pdf
    • https://francois-daulte.com/ckfinder/userfiles/files/lidolipovexevosomeluji.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4ad7334481eac449b2c2003f5fdb3bd5/wagetutomekarenidazobo.pdf
    • https://harrisitalia.it/uploads/file/jekutetolorarabubexowa.pdf
    • http://dolphinegypt.net/userfiles/file/tolofesenumuduz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=military+transport+helicopter+rust
    • 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_off0000dbd1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD1 16792 bytes
font_01_sfnt_off0000f3e3.bin
b1aa8005535e4172cfcac95291d9acb8fcaa274b30a2a94fb62a24e705cef1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E3 17708 bytes
font_02_sfnt_off000121aa.bin
cb6df58aaa3ac4d1d328638ee8480fd593aec344926c5c188dc66f230becc821
pdf-font-stream PDF embedded font (sfnt) at offset 0x121AA 10676 bytes