Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf8a3ca47fc4133…

MALICIOUS

PDF

87.6 KB Created: 2021-09-07 23:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 897bc67328322333df2b5e04c6ada0ee SHA-1: a6ec8a8d2530318688e87889249db3b2d3b78243 SHA-256: bcf8a3ca47fc413302204e3613fb32b7e09034d62d42b82731064a1eeef48c41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm on disposable hosting and multiple distinct hosts suggests an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://hasici-pristroje-eshop.cz/files/file/40143819422.pdf In PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e2d1c5182---mipikit.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4c8b714ea4df7304f13b1606b3360f0/93357145309.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/25359301373.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116a3c9e75cb---xinerubozasodalapan.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/24703259599.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/86099155003.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/gananilexerawaxopeli.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/jvg5a3lr4qmsleo6mqi6sgtsdt/tetisaxuxigexogapuf.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/berobawodanaselaruk.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/41980490651.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/40171719574.pdfIn PDF document text
    • http://www.heksan.com.pl/file/23081909898.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/08741eaf9129ed91066193bdd997be96/sofofuvifeme.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/zolipebox.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/wotubegavotisogatudafig.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ju2rb6r0nl2t8ov2097t39gt4c/1728730164.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/xijovudidetunutafa.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe6d997ff5---59636564281.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105200343.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701e865dfa7---79474052093.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6c1395fc---11130034056.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/kubijoli.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e247e5c---bulidosuvok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=terjemahan+kitab+minhajul+arifin+pdfPDF 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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 10900 bytes
SHA-256: 8af01d98d16163507d59128c793e1ad1a45e0c51dc174b2ef05a0263c0a84b98
font_01_sfnt_off0000f33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33C 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 23404 bytes
SHA-256: 3442f9ed0c1751ebe26ac99fc3fc33950e5e19f0e1672cdc49d1d3d4fd262109
font_03_sfnt_off00013690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13690 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1