Malicious PDF — malware analysis report

Static analysis result for SHA-256 706d2cb6409296b2…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 09:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: fc861bb79c86b5c5735cb971f3af2896 SHA-1: cdafece3e6a3dad363f007567ccd1e6594f1b4db SHA-256: 706d2cb6409296b2d7fe03861648b71ad40cfa2556a3881a78be5c22a37d548b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple external URIs and the overall structure point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://cructi.ru/uplcv?utm_term=appointment+in+samarra+summary+pdf PDF link annotation
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/d74d85a109eab51e11de16b0bf4ff409/witige.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/31213156455be608110e0a40c4ac3a14/86943955894.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tufoxebovanejijowobeg.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/1decd5c966668be2f43f2f02d351db65/gowewufenuganifuvifogeba.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/18708439220.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160e578173d2f1---74229482245.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4e38cfaa9e3d2b10a6389751bf8920a9/74128933094.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/aef0dd75ec4aef93c7b0a530d820dfa8/kusevitoxa.pdfIn PDF document text
    • http://area100impianti.it/userfiles/files/nibunuwekefemokofonebinu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160829544569d5---11330892437.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4f0983a9d46da84cce7b734499095182/29548644523.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ebb5e0f6a---manol.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/nijokijugizi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b762b7565---zisisidefom.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/fosezasalegadagadaromi.pdfIn PDF document text
    • https://menu2uplus.com/images/file/92559573283.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/3da89c7efb0eef8467930fec251aa287/soradugajamubebone.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/jinizinozunafujiduwog.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/98rkhntj3l6p9d7ieb48bk8g26/fadonumunefuxaga.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2bf11f9b6---51067183706.pdfIn PDF document text
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/mibemovaligujisikomu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CE 10808 bytes
SHA-256: 254421428b6b01818167d1e69c8f4345f7874ebe397023b3124bd61e863334ec
font_02_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 18560 bytes
SHA-256: 30349264ccd15880fbe4f22018c3aba0d492f91b3d8ca06cf9e6077a0d372b97

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