Malicious PDF — malware analysis report

Static analysis result for SHA-256 add865013acc5ec1…

MALICIOUS

PDF

86.5 KB Created: 2021-08-11 15:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e81183bd561d89e89974762bf57cf69c SHA-1: 47f57aa0c1448d2bc5eb9e469c9a939559d33319 SHA-256: add865013acc5ec1a922035e314a76ccd99ceb1b4aa70406f9f9e647580479f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to various external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The primary function appears to be redirecting users to these external resources, likely for further exploitation or credential harvesting.

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://pistant.ru/uplcv?utm_term=how+to+view+in+3d+google+search PDF link annotation
    • http://canoto.us/Images_upload/files/juvowoxepamidagadepedi.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608700211ff13---93208597244.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f095ece4ed0---58010900069.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/02e6a77442f663f0a91c4b0f76b3c576/duvalawugufezip.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210727045414210.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ee184f439---kalemedudisusufidawekufe.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/budenobudokoxubere.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2202166c---88413135956.pdfIn PDF document text
    • https://krossi.ru/images/content/files/tepufanenalufosesu.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0k103rk5miu8qphfeit35pr8q7/36100969816.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/76679348764.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vh2koju0e76q4bopvha4s6jub1/luxazeteberiwalop.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/73145473348.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/relijuzozemunali.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608485f85cbab---luvotejujewelonopize.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/d2fd78083277a38a41a98935b1f0afa1/62623589076.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/a8e7299d328d51cb0c45b579d4dcdfe6/muloditatuxudop.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/24899843575.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160826b765a7e0---ruwuserexipepuwigalo.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/foroxug.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af86067b711---86049075152.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609d919a81946---wazos.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/veluxisexuwalawo.pdfIn PDF document text
    • 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_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 17228 bytes
SHA-256: 242117755eb9e9a51983e776054b96d3d0616fc4be3054bcc4eee8c7a54977ac
font_01_sfnt_off00011b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B26 10964 bytes
SHA-256: 926a5cfa202f84fc3b967fc20dc813dd5518b7b9b0c15dca317590cdc046babd
font_02_sfnt_off00013465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13465 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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