Malicious PDF — malware analysis report

Static analysis result for SHA-256 305c4e095959be36…

MALICIOUS

PDF

92.4 KB Created: 2021-07-04 05:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 043743ba23037a1264c18169a4d697ce SHA-1: 9b7d7458be58bd972db375324feba174939c7beb SHA-256: 305c4e095959be361764fba9ff10240284cc30d88c5c6b9c3d7d730597186fef
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, each hosting another PDF. This structure is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly support its malicious nature, with the primary goal appearing to be directing users to malicious content via a chain of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a36b3da2e---44517443822.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e5bc3d640---sosojukujutidorurutu.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/948d84fa60dafd46a5f9a772520fb891/somugedulepigenozoko.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/olsv1lb113ig0pmtgctbp3c3e7/12888627141.pdf
    • http://www.urbanwaterways.info/files/gudobuxasekozipuzolojijuk.pdf
    • http://sva-jeanroze.com/xmedia/file/30519744625.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1606fd6db3ce07---88420104399.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c03ece9cda2---87898682586.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081053b3eca6---venogexenefomidi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c493a240---vudab.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/d48a5770dab70532504c6e862781cc3a/12129426566.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c200d637---7975048497.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/4kpdd1bope9csu7291a653mpv1/95102279836.pdf
    • http://studioguidobarbieri.it/userfiles/files/37650126624.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/d9db6941dc17df68435714b8764161f1/83104815008.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac95ca57936---gatuduvuru.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/e7bc668fa6fa522beebe5fd2de4adccd/18013539713.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7d9676ef---baxasamopita.pdf
    • https://condicionamentofisico.com/arquivos/file/24037165000.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/qsks6lsd1ubk1gdrm8sbmam735/72762469442.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a7c0eae34---kojevevegajat.pdf
    • http://www.hydro-tg.pro/upload/file/60021168559.pdf
    • http://candientushinko.com/images/file/xovipudemojukizunapix.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e96dabf26---26158019052.pdf
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6925d4e53b---zifigopowo.pdf
    • http://aep-tc.com/cache/fck_files/file/3464128288.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0340a67b---40611687185.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=if+i+have+minecraft+bedrock+on+ps4+is+it+free+on+pc
    • 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_off000100ff.bin
1eb17b6f145822e1caa68f1f7d40d4f8d67fd350c8436b35dee9a797db8f1d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 11164 bytes
font_01_sfnt_off00011ab4.bin
e0e39fd90e10d20242bdc09ad5891f381ec3a4c2840fc87381d417ab7ec60b4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 18280 bytes
font_02_sfnt_off000149a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149A5 16792 bytes

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