Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6221379fd64b05d…

MALICIOUS

PDF

95.9 KB Created: 2021-08-26 23:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff420d7a2be172af821f0fbf2e727f8d SHA-1: 88d9f777e8c11b9b54c1046489168a2ddf0fb1fc SHA-256: a6221379fd64b05db5feb74bea8496e4253c737b35909cfec308f63f77376cfe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://dailyhondaotomientay.com/upload/files/20916562440.pdf In PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/zevebafuka.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79850188850.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/67b39d4fc07de064069e026d99d2776d/91922345836.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/jemazotilometid.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607668ea4f824---garijopuritakifo.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e310ae7a6---liwol.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773da1774ee---73010117580.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fd3dc1ef6d2d8d15518ab973b2d62430/40834584992.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4c526b949ca3daa7f2c94e03ae8e73aa/75709007579.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/timaw.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/bsujcdhr66bqgif8974gqcrsrm/87280085532.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16117308c0e81d---28043716198.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sabanijanabamag.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f1b473d189b---zozutudidizikar.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/32407067684.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c378d82f36e---54540370572.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/2a8d494cf3ca46f7219fbe0043859f47/87376956416.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/3169414002.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16070a71f258e3---29344605436.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/30818069571.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/jijunobisexotomefevi.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/weverepobiwunipanowemi.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/58161547634.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/talobenix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=11th+letter+of+the+alphabetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 10184 bytes
SHA-256: 9600026d6e987f24f4b26e61af412c071cb04aa05daeec4cff160e44d6f4c434
font_01_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 20168 bytes
SHA-256: a2dc81f14d48bcd9c80fd814fc88d3a4109c8b1210969240e4496c8a480f00fc
font_02_sfnt_off00014f7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7B 2048 bytes
SHA-256: 21f9df20f227e8d8e40da5b43cfddd00bf1dede15ca1231093bca9ffa6c49901
font_03_sfnt_off000158d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1