Malicious PDF — malware analysis report

Static analysis result for SHA-256 169e364a56563cf6…

MALICIOUS

PDF

81.4 KB Created: 2021-08-19 05:59:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 12f8505570d5c99ea89faafc164a8824 SHA-1: 7e5f884c8a168e3a65e483667403890b471852d7 SHA-256: 169e364a56563cf6bc5db79c534118cc33c762101d87cb473ae6a37d1f74ac31
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://marinapogon.pl/upload/file/15789388024.pdf In PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210802_7DB19DBD3F8F72C7.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8ee21f05a---89413577930.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9ea468280d6432e8baf6bd2a9d204970/83957742356.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/4741912676.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/topuxinoruvigobopano.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16079b93c035a1---16230528956.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/87886501685.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210619223707.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/49779977573.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///zovejunujujiwinuv.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/84903664608.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tubulidevaxuv.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079b59336048---xubawojibo.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6bcbf2ccb5b372e474efe4d0418f30c8/35420185038.pdfIn PDF document text
    • https://sharenkon.com/files/lufakalapigi.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/41977915961.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079501dbb807---5749014441.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/nufizarinipamanusesirebe.pdfIn PDF document text
    • https://sambelteri.com/contents//files/luwomelifujol.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210616_D27BDD3118BA2365.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e6d3afe23---bavunewoj.pdfIn PDF document text
    • http://lg-palette.com/upload/files/mabuvotopekedafuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+my+charter+emailPDF 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_off0000ddd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD7 16296 bytes
SHA-256: 7050e451322953d1b0b5d17fcf22065f23fac7ccd27006e7e384f0737c06b41b
font_01_sfnt_off000107ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EA 10596 bytes
SHA-256: 5eb18104cc97156def699f5fa99b136179ffc89a86a2f9773c4db4eab10d91f1
font_02_sfnt_off0001202a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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