Malicious PDF — malware analysis report

Static analysis result for SHA-256 8841f172294e507a…

MALICIOUS

PDF

83.6 KB Created: 2021-07-07 23:19:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1d3084bc18124ba95e914f6e5155d038 SHA-1: f95ff9ff33094b9b376037f5c355600ef8cffada SHA-256: 8841f172294e507a35202137f9dbba9cad683ec01372a30de89488055898caf5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/43b142a664d1f5d84d94398fd49ba115/rumaxinexatazotipesufege.pdf In PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944229bdf75---19165038052.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/91bd0b3dfda5f38640fa4399eede84d1/5916290267.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gb26bga0e38icjlpdneuvsmkvk/44226315528.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/99394357535.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6bbb648c7---zotejivezowofolow.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/d66b08c9fb462dd66b5b595889c3a7d1/20236103151.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/53032066972.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/15626852919.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/apm2a177m6tudv4n4d9o0dtht3/13588869248.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/5rmbkb37ehhelt2l135rco3ou6/29354947374.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/23418624355.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/fakozubago.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/247747762520b7c134fa7a242621312a/givawavobezon.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098345cc2bca---xivuzadiwebexewozu.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/jotuwilefefutidabetumofoj.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/dc344c4970a48b06f7b85850ef48c9e2/xiroleraxuzefevale.pdfIn PDF document text
    • https://somogyplusz.hu/files/dojeladixonekaxev.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/maxos.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ea08610b806af9605be56a82be6b8aec/nurijo.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/sulapit.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a889688781a---32282066097.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a6b1bf163---fozadilubigej.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/kojixoku.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/32663074420.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=east+north+street+elementaryPDF 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_off0000e1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E3 10380 bytes
SHA-256: 32ba8903f069551bc55004456503e3d856dd44165bf6154d90d61293279de73d
font_02_sfnt_off00011136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11136 17612 bytes
SHA-256: 489c2ba047500c2b2103af6214e0e82046388ef94d66b1abba608a29100cf411