Malicious PDF — malware analysis report

Static analysis result for SHA-256 321f35dc0734ad48…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 15:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3b612efdf6244bc2d43d51d69ad13123 SHA-1: 25b6964c5c83fcc3f09bd81b750906be80da71ad SHA-256: 321f35dc0734ad487bda4152c7f0b653fff34d053daaffc46f6b89487d33141d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The embedded JavaScript and link farm structure suggest the document is designed to redirect users to malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608356e81c16b---sufotalov.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4fde21841---jejiwewemupekezakutepev.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/979b8346a09545fa2443630489f84e97/reguzarufolewuwirusetekug.pdf
    • http://unseenadventure.com/userfiles/file/79204801651.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/e591c50f6d15e02588fdf59d1677a42e/34725930135.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607434f5bbaec---zikis.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b6a81d0fcac0cf14da0c798afa24a1cc/73412299087.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde30c5682---feseretatut.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d8cb963ad---nowakuxomufitumotolive.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8462217ed1---mudovakujex.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j3p81acva75pjarjc87i3v70e1/232414022.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/3d5670fad3731d440baf5c5631128148/boxidata.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8caf75cd790f0197ab9cb907b808f1de/bimikemifima.pdf
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a8244158fe3---87549888927.pdf
    • https://rybczewice.pl/userfiles/file/kuvipunuvejerokew.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160833291ec1b6---74155208710.pdf
    • http://massimosusto.eu/userfiles/files/26428308642.pdf
    • http://tgtech-auto.com/userfiles/file/gegab.pdf
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/c188abe44bb75d5a5b8f9498b30843e8/61889992424.pdf
    • https://itexpertdog.com/upload/files/tatibunej.pdf
    • https://glycocalyx.nl/userfiles/image/file/xirabuzoxiwepuj.pdf
    • http://technoauto.jp/js/upload/files/mufesurumova.pdf
    • https://vannordenvastgoed.nl/userfiles/file/votaxime.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d23438848---vitamolivovina.pdf
    • http://henca.com/files/details/file/xakepina.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=aprilaire+model+600+installation+manual
    • 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_off0000e8dd.bin
a4efdabcc4e8f5bd3cba13d94151eb76104dbe330531a11b887392bd8d0ed728
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 10924 bytes
font_01_sfnt_off00010225.bin
7ca10758ce5418f82764dbb80c9e7dfbe60f0dcb8fcdb08918031f006bc20f83
pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 17864 bytes
font_02_sfnt_off0001311b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1311B 16792 bytes