Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e1e518b7768a331…

MALICIOUS

PDF

88.9 KB Created: 2021-09-01 22:09:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2cfb625cac18a9c31686773464d273e SHA-1: b5b188dc3cafeab3fcf6578745b979e7f0707c34 SHA-256: 6e1e518b7768a331308adbfbc06b51980bad6ed1bf4b48e7fa723d42c23a0564
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this file as malicious. The primary purpose appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://cochemical.com/upload/files/42761250333.pdf In PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/1ad9ef215c2068e670f817d2f7575498/menapazibo.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088c003846f1---gekalajedisagegaf.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/059fd3fbf2536eb9bd530982e32f2599/bexirus.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d7f28d17f---24818994804.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098392a65944---pixitesiladulotuxagitifa.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/55579974213.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/kimaxugebinefukejiku.pdfIn PDF document text
    • https://energooptima.hu/upload/File/56093078395.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/kakewo.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d6a5829e4---76140353723.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/lltme3sngc9lvh8eac0cgtpvm5/rasawazazomujajomej.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16085392dccc41---peromuxane.pdfIn PDF document text
    • https://cevhertemizlik.com/userfiles/files/jepakazaripo.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/sufagimudagelip.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/wunagujovoduxojelire.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4ade8f381---21195435660.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae48386c10---68912687943.pdfIn PDF document text
    • http://riph.pl/userfiles/file/82843096188.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/9227077170.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a18939ad297---35686632716.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/ruweburamu.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/85526140280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=yellow+carnelian+meaningPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 20076 bytes
SHA-256: 4dab861836ceae8dcb0f1f5f3cf18168ad4f1dc4e64e95dae5ce5a49539b7f11
font_01_sfnt_off0001264c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E63 10376 bytes
SHA-256: 27c33bc17fee1b5eac9d6e655b7d7d4ea074ecd07106e0c68f16360daa65a674

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