Malicious PDF — malware analysis report

Static analysis result for SHA-256 3453cd372ea4d060…

MALICIOUS

PDF

119.0 KB Created: 2021-07-02 09:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4415460c3f3bf330ad9c1266af7cfc86 SHA-1: 6d1bbfc5d077cec1b8e107080f0d3547a6a3af47 SHA-256: 3453cd372ea4d060e47515d431d9d5a9f6c7c9a4ab119c72a4ac5e18fe722a63
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or malware downloads, serving as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b167ba0f677---fujorokudolu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ad3a97f34---ruzinin.pdf
    • http://geo-equipe.it/userfiles/files/mekapugutusaxowogavewawu.pdf
    • https://charlesstreetvideo.com/userfiles/file/68261558192.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160778906dfae5---zizadakavegaxizubugako.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606eac2fdc38f---48320905107.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607624bad9462---87905270299.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf4d30764---samozus.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6c5d974a0---18696368931.pdf
    • http://firegallery.ru/img/upload/rusezadod.pdf
    • http://ruishikaishi.com/upload/content/files/2021/06/20210612060946.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/1434d75bcb866f90cfb340de30214f1b/90768132297.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f84264afb---67305643313.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fcd6a80d---zufar.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acdabf42031---diroborakevar.pdf
    • https://alutat.com/data/file/8231484751.pdf
    • http://domeinbeverdonk.be/assets/files/file/28311666930.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d302b4b8---xipapagunubepedimamewu.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/fc30de44f3c1c166efcf835a0a7cef72/tunomobepazekanawatemi.pdf
    • https://bawaniint.com/ckfinder/userfiles/files/67396493114.pdf
    • http://cybernet.asia/UserFiles/File/64758749449.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a3a221b9ddcc04a0541d0104f43c6665/12672510771.pdf
    • http://circuitoinsulargc.com/documentos/file/16717778219.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+hogwarts+mystery+quiz+answers
    • 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_off00016e52.bin
d8ab5a2a4a16202f8bf570994c0aaf7cbe8cb7b95fd9bfbd77af533c4ed4c0a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E52 11152 bytes
font_01_sfnt_off000187fb.bin
0fd6c39a1d115b29745283063d678110b863b1dd58f357cc092b17549f86f0c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x187FB 17920 bytes
font_02_sfnt_off0001b6b5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B6B5 16792 bytes