Malicious PDF — malware analysis report

Static analysis result for SHA-256 a456b892e8492f62…

MALICIOUS

PDF

89.3 KB Created: 2021-07-15 17:45:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2263c0294096212d9549f6e9a285a00 SHA-1: 3b6fce63d0163897ddba13aa6fa27d60446ba2ce SHA-256: a456b892e8492f62e504b360de2fb52049c4e08c911b9aeb4d58294623a35f8c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=aussiedoodle+docked+tail
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/9532352c0bc7dccdbf41ce33c4c19e59/25657787837.pdf
    • http://big-blue-bus.com/pics/fotos/1/file/lujez.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8d154a2ca---kisulilaxakosu.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/69kni80rn49tqatqr8dg43o1b2/pakunuluwadaf.pdf
    • http://www.prieteniitehnicii.ro/documente/file/17497636164.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160764b2c47fb0---mogunax.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c774c42112---95703998734.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93e041211a---fadadabevowulofapewu.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/funotutiruwas.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3dce3556---33528036790.pdf
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/18765784530.pdf
    • http://guanzhuli.com/userfiles/file/furolutogagunugekeviva.pdf
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/cbrdb8t8jo9vogvtqt7894tjkq/majunasijivo.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c495ff1f81d---6025121432.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0085e0a0f---85274942431.pdf
    • http://atut-biuro.com/uploaded/file/4939665536.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607db1ef2b0a7---26193184131.pdf
    • https://murten-hotel.ch/userfiles/files/veminilekafozowirar.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1d0a9ff0e7feac8ea667501363279c33/wiginuniroritaliwize.pdf
    • http://kozszemle.hu/uploads/files/vijojinexulezi.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qoka7se3r1s4h144labkc94vv0/pizewutileravuwebe.pdf
    • https://superpart.com/files/13582184336.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/f913e83a498d7ebc7a28c97e875396a6/tigakevefojabi.pdf
    • http://strahovka66.ru/userfiles/file/notofitejofusuninim.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_off0000fa81.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 16792 bytes
font_01_sfnt_off00011298.bin
60d495d415001b5f8940324ed8795ca0c867f0a31c87536204dc5f19c023729a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11298 10332 bytes
font_02_sfnt_off00012a12.bin
5520f2d6a3f1d8986b588cfd4a38a03ee39f67f0c46f21ea13e625c66d0ea515
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A12 17152 bytes