Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c1719506bce93ec…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 05:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d75139a142ce88efd49c88ffd721996e SHA-1: cdfcc332dd5e474617f6068de24c7677a07ce5f4 SHA-256: 9c1719506bce93ec3dbb0eebb7170fb129068f8e3eab4be36c804871c1b3135b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories and disposable hosting, suggesting an attempt to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 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 https://gulf-rope.com/images/bulk_images/files/90488403110.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608de827ac8df---51764219218.pdf
    • http://elfuklid.cz/foto/Image/file/sufarikixunaxipimekiro.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a693f4a317d---jinoz.pdf
    • https://mabuksusu.com/contents/files/74430483742.pdf
    • http://laibros.com/ckeditor/userfiles/files/nimefuvesesedulilaj.pdf
    • http://studiolegaletrotta.eu/userfiles/files/totazetuzikipegeju.pdf
    • http://isgsrl.it/images/file/70778619164.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/smr6t25mdmljqp25k78843bfq8/2098123324.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a052424f119---58245280630.pdf
    • http://fotossc.pl/_files/file/govemeromado.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/44daad1e7a54c599f256002e5bfdaf96/fisabi.pdf
    • http://aqbnb.com/uploadfile/file/lazewigidurixilarofegadi.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909b3f8c94e---16784640782.pdf
    • https://sahodayabbsr.com/test/fckeditor/file/joloti.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/48e0a0b317f7b59a73d1e6d8b791e1e0/89831937396.pdf
    • https://bluza-shop.ru/content/File/wexatebanuzejudafusogak.pdf
    • http://arohitourandtravels.com/userfiles/file/39753302934.pdf
    • http://technoauto.jp/js/upload/files/wosajap.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609031f477706---28363805002.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/9mh2o284k6c366a4apnhouuk1c/51196326077.pdf
    • http://vipnovini.bg/root/f/uploads/files/wevoz.pdf
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/ruzexafasapudodiwe.pdf
    • http://hoshitorionline.com/uploads/files/15988539425.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edcaef6bf18---22874059535.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=accident+manual+of+central+railway
    • 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_off0000c3d7.bin
8d625ac0400d4d721563b1aa240533b60d29e773614cbd0f68fa460551444b37
pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D7 10752 bytes
font_01_sfnt_off0000dca3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA3 16792 bytes
font_02_sfnt_off0000f4b5.bin
62908354994baac7fa3bf3d30a78fff6ef5cb8da3b0ef2f4d04936892e303c13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B5 16652 bytes