Malicious PDF — malware analysis report

Static analysis result for SHA-256 be97c93d094a89a1…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 00:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65447e890964380b56ca153b69167b6f SHA-1: d227ad8bc9261c1205532300fec6be43ea3d244d SHA-256: be97c93d094a89a11b8d9101a0a1c9750c65c562d7b3a7e7d219d74b081b89dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed as a link farm on disposable hosting, aiming to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=android+notification+bar+not+pulling+down PDF link annotation
    • http://studiocariola.com/userfiles/files/raruwijejilava.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/57557495265.pdfIn PDF document text
    • https://1snrpaulista.com.br/ckfinder/userfiles/files/mebotavozibubofuvevadewix.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/045ba3d6f95a0908c0319c61000faf6b/31014523854.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021091307015380554.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/fopidejo.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/3852386141.pdfIn PDF document text
    • http://ipublicity.cz/data/file/51636073241.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/17389933239.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/wuwukidurex.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/7005484250.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/zipovolaxozajunidugabeset.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/80420823430.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f906955bc4---3956204202.pdfIn PDF document text
    • http://envigest.cz/upload/file/49868101316.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/83112d58f3dc65a1cbe58397820b7865/18559957110.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/gikubifu.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/likafebi.pdfIn PDF document text
    • http://raczcsalad.hu/files/39898438131.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0ko3lokdsjsthplihemjok8m84/53834286411.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/jonudejizowotafakanexaku.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/70324483005.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/50915574616.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/80634223460.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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 14864 bytes
SHA-256: 1dfc2417bf3fdc327e11365aed35cda2c0c9779be93c0ae4955de3eb7366d2f9
font_01_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 10804 bytes
SHA-256: 4dae8dcf84154646498ef546a464251d9569efe48f1c0b5679a591f768f7e690
font_02_sfnt_off0000ef23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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