Malicious PDF — malware analysis report

Static analysis result for SHA-256 9533fbd06faabf77…

MALICIOUS

PDF

87.8 KB Created: 2021-07-07 20:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c363ae8503c482f9be89d99da8649295 SHA-1: 5ca089a95bfd90ec74c047a3dc5b05b84db4f465 SHA-256: 9533fbd06faabf77ec957dbc9d8df32b9221c54c438dc5abf04038201cce63f7
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the classification as a link farm designed to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://aczelzalog.hu/tmp/lujikopuxikegufop.pdf In PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/37fba07430a31bb6d956a69bd2676664/55370827125.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/7a4quu632u05cld6b16nd2o3o1/47007951258.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095cd62cbccd---zogunaf.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f69dd97be---95622185728.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c661fd5e29368e8f5c7d5dd2c00d9a84/zakopipemaf.pdfIn PDF document text
    • https://kopari.hu/files/file/notik.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ca309e0b9---66738242440.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd36f830da---83892918820.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210702_955BF155C8C95050.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dea7ed86a5c---68496385625.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pimamikibutakodogamajuwe.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/97706042373.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f692d1e78---30388049269.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/bi2l3i9q25538iq33qkbufkt16/zokidanutitonofi.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/68172522778.pdfIn PDF document text
    • https://ancoraeducacion.com/images/24133705411.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afc5f17db52---63813245384.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/5hddfvdu49m9lf643q9gm5kkmi/76510757375.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/21073983203.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2s802j9bhf47bb6asqt8dapc91/lefosowasuniwidej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb6c0b388---xotesode.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712f2628bc3---75694238863.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/wexatuvopenavuzo.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/fkfvjurl9luea6nod3jltarvf4/vomegukakawalevexin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=actress+of+golmaal+fun+unlimitedPDF 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_off0000f36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36D 10900 bytes
SHA-256: 14b49cabb5e8936f1c5ed8d6d22609a2836212bcb56a4a10e17ea06b45eeb830
font_01_sfnt_off00010c7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001248e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1248E 17064 bytes
SHA-256: 2e7e87e18792cdae09f82b7bdf9e723b2af14e9b584e747a2bf568dff6c0b764