Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ce1b4d4dde6656…

MALICIOUS

PDF

81.5 KB Created: 2021-08-20 02:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d1f707f53ed27bfef4887f0a2d61bc1f SHA-1: 985e0e3ed35456419378954930b28508385ad4cf SHA-256: 82ce1b4d4dde6656ad9c6b559f746ec45028823762c3783a2ae09c935eef0ceb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised WordPress sites, likely designed to redirect users to malicious content. The presence of numerous URLs pointing to potentially compromised upload directories supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160f44e7ca02ab---19525367905.pdf In PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7c4433b20755b8872a01c494e1aa1221/86104981069.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/tusuzovemiz.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0bbb44f2e---siwigilipepisisogatizum.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf6a90f0a1---58147164804.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/dudekazofi.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/90787820353.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16091abd546b69---dugajel.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/fdc61e7b70e05fda613a7b333b92b26e/15262814888.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/birizopo.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/nidesasadoni.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4ca21afa21bbf258d3d1595c46544d95/sirajekajagilo.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1624452823.pdfIn PDF document text
    • https://clubesolbra.com/uploads/files/tezajixeguvedetefometa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de33d89a3f---27629990963.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3f828701433b2bfe250e5777da077f48/47643690338.pdfIn PDF document text
    • https://invest.pl/userfiles/file/vuwiporixuvus.pdfIn PDF document text
    • http://coumert.com/images/file/21486110596.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/84616348899.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/vebizewi.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bc71801e7---vuwapipikiluwaxolo.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/65876585569.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607990e4447af---20556335900.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16094ca82aa5c4---jinukurasizevamin.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jowifuwaxogopivenuga.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/90951661732.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ks4+amapiano+sample+pack+downloadPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 10724 bytes
SHA-256: 07fb958192cbc84b4188d3b27814398fe3c708051e02e639a942eace4d3611a6
font_02_sfnt_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 16304 bytes
SHA-256: 72b6d5534888ecec27fd68dccf88827b5fbc3510db23809d90398b76a33fedee
font_03_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16948 bytes
SHA-256: 5daaf722e13a8cf438441c5e008854a16d1555759f6ee3f72d85fcb6acc9b0ca

Open this report in the interactive analyzer, or submit your own file for analysis.