Malicious PDF — malware analysis report

Static analysis result for SHA-256 817cd95693ffcf6e…

MALICIOUS

PDF

85.1 KB Created: 2021-09-24 04:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3e8ba244a52e804858deac77372e7002 SHA-1: 1df310bae9b7850a95ca3e70bbf03857f9696108 SHA-256: 817cd95693ffcf6e4564ece2e142fe8b967307e7796efd39f5516b2204fb36ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://carmelocuritiba.com.br/ckfinder/userfiles/files/42852937072.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149de7481b31---jimudavalawe.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/7a8e6ff06d6053ee7322ec4a70e59d5a/bawafovumekoxig.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/newaluzakovubip.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/66949527684.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/zepikotawexuzurusiwiwupe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/7am450l2btcdp8a66mlajfrmir/gibuzo.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/37645042543.pdfIn PDF document text
    • http://awards.nl/img/cms/file/36669808757.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/35885185914.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/binobaraxud.pdfIn PDF document text
    • http://electric-kernbichler.at/zodadetil.pdfIn PDF document text
    • http://umhouses.com/uploads/files/nabiviruvuromolonijarave.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/sefazanasufonuliwi.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56454849817.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/68000592608.pdfIn PDF document text
    • https://actorconseil.com/files/file/37120879040.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/rineromu.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa03fe539a---49080421410.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/xubefirixujod.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/28540651430.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/gitaworidaruderofinaluliw.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/7147103634.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/32601326677.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/pugojafawipubupizuruju.pdfIn PDF document text
    • http://jadeite.ru/images/file/12686093802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=best+offline+voice+translator+app+for+androidPDF 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_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 17628 bytes
SHA-256: 24127038e3ed9de9c6589b7437d1cbcef9d7226842ad17017f81d1be6e97113f
font_01_sfnt_off00011508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11508 10732 bytes
SHA-256: ba67a396611ed4038b9ecdcd9af773ec927c911f17a31fb31428be0391a0ee19
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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