Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9ccc3627659a071…

MALICIOUS

PDF

104.0 KB Created: 2021-07-07 19:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2f2c878f1b232cebf75d88628aa827e2 SHA-1: 1268c2e16bd2bdafe76d84f403c45f3131d58990 SHA-256: d9ccc3627659a071075568f8da2ca2c1184f883746400607b42fa775e4cd88e7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or serve as downloaders for further malicious payloads. The presence of multiple external URIs and compromised CMS upload links indicates a deliberate attempt to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9657

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://irlanc.ru/uplcv?utm_term=chemistry+worksheet+matter+1+answers PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085645d4a6cb---29982112352.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/86041340195.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/wabarozekuveboj.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/42809161374.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/15938601790.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebcf24bc90---20591338887.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/46645467925.pdfIn PDF document text
    • http://strandedtattoo.net/file/daburudilaxi.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/85992196532.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/bomilaxatur.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/xexodufu.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/8a483fbfb40181fc5d3d087a86513e30/36750865178.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/27p9g75icmv59s4ad8rbepdjuf/mosebosip.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/tdv0gdvrc12jkoorr5869i9p1t/wimepewodidezu.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/ace221327189bb9ef8f9555f6c2bd264/xidise.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/57560198744.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082001ecdfdb---49487192411.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7637dcd326e3a2902ae1d8245f46c66c/xapasonanajof.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/bac2b77ec3df5b379e600d709291ee38/91629737584.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5885698031f66841d26f212a0b613bc6/tumawefamapesexaluxib.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/f4c5de77cf52268a1f7fdc879d80bc70/27010832852.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/1060015188.pdfIn PDF document text
    • http://scro.ru/pic/file/21574570218.pdfIn PDF document text
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/33bf2c978de884e7f6fdf4181a1dbb29/lufewonomosidukos.pdfIn PDF document text
    • http://stylekd.ru/files/6898098445.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bdf5ebfa26e97568fea586fc66b46b55/tomodasafifugevelofevifo.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/rireruwo.pdfIn PDF document text
    • 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_off00011cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBF 10700 bytes
SHA-256: 750b52ddfa74da9d0fa190190826b2bbee5838655207e0de7a2eb77bd24ed344
font_01_sfnt_off0001354a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354A 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_02_sfnt_off00014ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000162d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162D8 17956 bytes
SHA-256: a8066445e880cd5d371326592e36948da3f3e7ab0797c316b6213b1a7b495dc1

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