Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ab38c9243bf9c05…

MALICIOUS

PDF

77.8 KB Created: 2021-08-28 10:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06e9b9ab6923df4e799554f47a414007 SHA-1: 7d8acc7149ff9fdcd17476c0b96ae5c428b9a9b4 SHA-256: 0ab38c9243bf9c053d8ca5ad6b517f5af9bd7bf8e6884fc2aee54e800a1abf12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious files. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114c6597d6dc---vodiveraxopulazanugumon.pdf In PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/cjdln3akvhsvvgsll03hmbs4o4/77240620078.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4072454e47---27533704937.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1610c95d7db19d---1972353130.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/pejipememiguniburomi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/navotokuj.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/konumenizifabifakavater.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tekutifabesudusoximebu.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160982b823af04---nalepodadilemamawevizis.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ee802b4342f1b4a1ccdbdf7ee50dc670/ximad.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/50024653693.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/uogrq1lqv4lipj5lsrd3i3rnp3/11326425327.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/26603001265.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/kogil.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/f544bbde4a389e31dac9d5e21a0414a4/31862358392.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c283ace0---33584818308.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/95900172885.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/98350201478.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/bapigetijev.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7441a9a20---87981459517.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/36525199743.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a745fc0b770---kegununevales.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/70734948372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=oral+to+iv+morphinePDF 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_off0000cb89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB89 17952 bytes
SHA-256: 95a6e623df18ceb1512c25c5fa75daa59bd8e0cb96cc83f6016ba6e05602fe6e
font_01_sfnt_off0000f943.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 10440 bytes
SHA-256: ef203bb84f6f62a88f92060d0f62c086304332af0620cfab8a58299ec93a315b
font_02_sfnt_off000110c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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