Malicious PDF — malware analysis report

Static analysis result for SHA-256 f886874e193fce70…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 02:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a84e6e11fa14f4550e670500833a96f SHA-1: c281a8140f6c3e21a34e5080af814dab493fd1f8 SHA-256: f886874e193fce705fca396385e92ca6d3e75d50a12c2035012073138946bae8
156 Risk Score

Malware Insights

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

The PDF file contains a link farm that directs users to multiple compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082494f98c18---pimovukajonod.pdf In PDF document text
    • http://w-f-l.de/user_img/file/totawiz.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/67462621263.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a061c80a5a4---turujiti.pdfIn PDF document text
    • https://cmoretv.com/userfiles/48129988367.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/fc3c702420b3b5523acc07631cbaff04/sugorixireredevumexe.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/falugivosefexejakozuzaj.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/gubegezonu.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/224bc9e9c36851f366793bd253f1c4f0/vipuzifajul.pdfIn PDF document text
    • http://abwrva.com/uploads/files/kebasaguwavobamemabuv.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/jamukiravixav.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16088036e6ef14---lapekivokok.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/42741192673.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/54550324092.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607a746448955---gibubelis.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/vifagipiwoladiwaripiko.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b51219e112---zinureluzenomomagedumetox.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/biboxixuzu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210810010147.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/56409736536.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/94146249686.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c73afca07bd---50579131055.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/64690674327.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/tamokili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=compress+pdf+files+ubuntuPDF 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_off0000d7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F5 17276 bytes
SHA-256: e9d1d1bc7791410f86f7f0bd0b1ffde5efa1f079e1fcca6002e707ea6201b96f
font_01_sfnt_off000104d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D2 10768 bytes
SHA-256: 36fb0d2ab45b9d954f9dd8f41dfd034282182621bbaaf36ca9bbae6e0132836d
font_02_sfnt_off00011d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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