Malicious PDF — malware analysis report

Static analysis result for SHA-256 6eb72d85e7917da1…

MALICIOUS

PDF

87.0 KB Created: 2021-08-14 03:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c054710867a0e256197c78c5e3b1d00e SHA-1: 9256308637f9af407b69586ac29aa44e7ea5d331 SHA-256: 6eb72d85e7917da1b4227efc375cd71fc6a1cf727bcf011a2a4ba005b97e279d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the nature of the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/omsu2pp4dt671p4lhe4i8m5n08/52028400208.pdf In PDF document text
    • http://geologocarmignani.com/userfiles/files/xubitupirenivixi.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/23038266257.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/2185e8b55487a57cbaea0125c01d20a2/45892089567.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/pjqrb8vsmuq146od8kkn679r1i/zosugowawidesuvazirun.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607822bfed5bd---19240345292.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/47fd793e476e03fd7cddba12bda1eca1/79278784784.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/monabutorow.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16089447ce5030---4343629120.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf186bb983---93372307790.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb5e5645a---7266100534.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/d02f765751593e894cbb2381d81465d3/43843505188.pdfIn PDF document text
    • https://hse.tw/upload/file/tewikaraz.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/52297913212.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/xikunuzipizorisupi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/75979888445.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/junaj.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608e74de4c736---40405874965.pdfIn PDF document text
    • http://placc.info/up_image/nidakimitede.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090268d977bc---bevosidiwizopup.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e198bf245---68930579019.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210713_3B479021B79AEAAE.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=convertir+kilometros+a+millas+aereasPDF 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_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10456 bytes
SHA-256: f0f770aa9995a2f55dee9dbb336b2408a4697bf7081b88f65d1fc00fbf316b29
font_01_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 18500 bytes
SHA-256: 3795d83911a08462aa850d62c1e06c534b22e1e2e43c5619f6d1b1ad5aca9311
font_02_sfnt_off000133e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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