Malicious PDF — malware analysis report

Static analysis result for SHA-256 610d05ea3140b183…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 02:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b494ef66157c1d202bfa0bc47d22dac3 SHA-1: 0431a189a7eee8f71d2822add07744a645d80f13 SHA-256: 610d05ea3140b183a25faa4540d10ef050237d46c8348745625931e91f787618
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://triosms.com/userfiles/file/xesetelipanawalusobofida.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/aae6a2cd71393fa7d656a32b4e1b75af/lapalosijal.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/kafovix.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/98224409369.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/57679181310.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/29472782096.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/nefuwirojatig.pdfIn PDF document text
    • https://abss.pt/userfiles/file/lipunugader.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/40540085426.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210902084827.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/lifixaporulirososefanofa.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/fi579np8oioan9hbrd2f6h8jug/42940614288.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613762cb7580c---85781344674.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/32b5729e10ddee36686bd8a8b03cf2dd/28135520055.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/tefofili.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/tawejabazuwalogigu.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/88809549582.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/dikuro.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/noxolumirusa.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/mobuj.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/6794825222.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/41277299102.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/jasobumapomolupaxedof.pdfIn PDF document text
    • http://123dvere.sk/files/file/18269242242.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/64601801327.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210901_195224_154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=123movies+the+book+of+lifePDF 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_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 10656 bytes
SHA-256: 8744afb5cd9206991babb8158e4fe58f6eca5ac65facce54e27cc15589944b71
font_01_sfnt_off0000ee29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE29 17472 bytes
SHA-256: 8464feafebae5ff48f38ea910c81d0243d6ff8d952bfb355bf1b644129860c3a
font_02_sfnt_off00011b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1