Malicious PDF — malware analysis report

Static analysis result for SHA-256 e685b804b40775b4…

MALICIOUS

PDF

79.9 KB Created: 2021-08-30 19:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41cc30196801e15c7b7820bafa888369 SHA-1: cd6f4516efffd4f7037f9b219085bf4ca48ee00e SHA-256: e685b804b40775b45d912442e21170479616b8731ebdbdc5877a88d93f23dd90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a link farm pointing to numerous distinct domains, many of which are hosted on compromised WordPress sites. The presence of external URIs and the link farm structure strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/vrc55ndho6ggt3vjmq16m72333/75556272907.pdf In PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/008247ad5774adf7597920dd547e222a/kapunumugega.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/24604262003.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/takugusitozewapawek.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/buminefataw.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/46667882459.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a10817ecd67---kijukegofapomefoxexakum.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kexinelovudidiz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4qaf4rdsaohingjmfagbdupgdj/96175316099.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/wexubosinubebedumalaxi.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/16304539986.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/eu0t71ijhfao53v9oc7eoqbka1/widutedulerunoloxosu.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/90567704823.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/5082238169.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac97eab5bc6---32706004364.pdfIn PDF document text
    • http://stylowa-pss.pl/userfiles/file/dodebukemenudilutenewodim.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bb8fc2b60---moves.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0b9e18c5---91561103688.pdfIn PDF document text
    • https://xn--lenachatka-57b.pl/uploaded/file/6379464148.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/rinuwuxetefe.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c393cdb17e6---46926055020.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/pusopemelite.pdfIn PDF document text
    • https://usdcp.jp/user_data/userfiles/files/nigusufoga.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mv2r4ifagug49lj158n7nboboc/wejanov.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/wabopades.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/17242794068.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=i+thought+i+loved+you+but+i+liedPDF 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_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 18400 bytes
SHA-256: a9ea542405ddd83cc3a7a60801cc44e89edd5c945d6e1be75e47b9c673b3b5c9
font_01_sfnt_off0001026a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 10364 bytes
SHA-256: e25a50c6d387beb9080fb05abf385763c108ee9a561164e82abc76078152fbae
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1