Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2d6c554c1c7af49…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 11:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cdfdd7482ebb5a5a0b7e4666f6015be3 SHA-1: 7fcc8936b6d06226f83e5d1a6c8d2811fac06322 SHA-256: a2d6c554c1c7af4948fe2deb3e0150adfbcfce901cadc8bbd67a95279d37a64b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous links pointing to compromised WordPress sites and disposable hosting suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://accesoriosalmayor.com/images/userfiles/file/nijeworoga.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6ao3t8q60stpacmh0n4ipfooo0/waxojeramawijoxigire.pdf
    • http://ecogestval.com/userfiles/file/nujalu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd083b2c0cc---23169579135.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a6427508---lovufebugobewowopir.pdf
    • https://wkd-uk.com/wp-content/plugins/super-forms/uploads/php/files/c7963665a00254fbe626756562404126/zelinoleneravem.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/6mvbs1vaum0g1kccn3eg5ngpcp/padusigexawalunugi.pdf
    • http://www.sport-konyv.hu/userfiles/file/vupegupetolojojat.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/7f844de5eb8a240db73434f27bb45382/36286957133.pdf
    • https://atl-50.com/files/file/87566633432.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3356d3ea22---88279297156.pdf
    • http://wenxuezj.com/images/File/6464389804.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec21bafe51---birunaxogobibonimazixi.pdf
    • http://unipsyclinic.com/userfiles/file/20210509182103.pdf
    • https://zlato-eu.sk/upload/files/76568759270.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/27152498413.pdf
    • http://kibbkw.com/uploads/file/watevobokobulawupikejiku.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a6468d769---62663871916.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072be1244e07---32541934419.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ab0259a3---kidunexikajoserimelubi.pdf
    • http://alarmy-kamery24.pl/userfiles/file/94095672126.pdf
    • https://prtl.pl/userfiles/file/laperetizif.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/39a9bdf4de10e42b626c9cb12acae6bc/jogelatobo.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9711a9398b---54642650018.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=safety+harness+training+manual
    • 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_off0000e881.bin
04964fac16392ae6023f6b19a966ed5c0b23a7f019287265a816934979383128
pdf-font-stream PDF embedded font (sfnt) at offset 0xE881 10828 bytes
font_01_sfnt_off00010149.bin
891d085d968a39625aee4d861e6833e25e820b69662d1341d192e88a3197ac08
pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 16624 bytes
font_02_sfnt_off00012c30.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 16792 bytes