Malicious PDF — malware analysis report

Static analysis result for SHA-256 77dc27167d691c9c…

MALICIOUS

PDF

75.0 KB Created: 2021-06-25 23:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61a0982864b63be7b9a813ef8683c5e9 SHA-1: d6e0edc570a197d34bc0d16ebfb971f5c7d54fdb SHA-256: 77dc27167d691c9c295552868858dfdf2de3d44a63954159b5d2d7313918d454
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically identified as a phishing trojan. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://allytemp.ru/uplcv?utm_term=js+create+element+from+string
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/pelofokujuba.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f259dc00c5---99102921036.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824c2d461a4---35323233905.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c3822de38be34b2ec8ccdb06c2748c20/pepinudu.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077a848ef12a---44679294955.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad16d88216---zevozuxefip.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ab00524d---47804114222.pdf
    • https://usssecuritate.ro/userfiles/file/zuwavodagusagimiribe.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4ffab7b1---konomejopubefaxobu.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/762bcebc25203b8d4360e5a560a50e30/9148511566.pdf
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/882277f456e4533eca44698bba5c2d84/zazawasapojogiruvatov.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0qppb5iji8j0qhdopu53a624s3/rifatoxusuj.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/461b3ed4378b5962034dbc5efd60de0a/wugituvogixavefamu.pdf
    • http://kleinschaden.expert/userfiles/file/zutemidibizivot.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/q5dfm0q7anct4l2kubn9h3ehgr/77177476385.pdf
    • https://biogenetixpharma.com/ci/userfiles/files/devowinitigemunevije.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607289f25d5e2---zuvomunix.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160982ade7d3e6---jobapojeri.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d47dc844e9---jojijujaxoxexegujukulum.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/07c2d6cd3114f5e7738f4f74396ac5a5/99486234163.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/f93a890aff1d000e37f47685f116c60e/mukopimo.pdf
    • http://bjsprt.com/uploadfile/file///2021061415052181.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d00fb777bf3---wolexuvomupefos.pdf
    • http://csc-021.com/userfiles/file/20210624015835_42k6za.pdf
    • http://norilskgu.ru/userfiles/file/1571398830.pdf
    • https://weddingitaly.jp/images/file/34562030940.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_off0000c396.bin
57860636e7ad415543a001a59ad6478fcddae90a36075608b515615344b9af65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC396 10672 bytes
font_01_sfnt_off0000dc12.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC12 16792 bytes
font_02_sfnt_off0000f424.bin
dd6c17d5f27818b4fa163ef9db4b94c48f63952d8ed5b1f023315c6ed9fda065		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF424 16396 bytes

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