Malicious PDF — malware analysis report

Static analysis result for SHA-256 996236cae2167fdb…

MALICIOUS

PDF

86.6 KB Created: 2021-07-01 12:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 87bf0c3430859074e82aecb707fc9f0f SHA-1: 6eb5f4bbe69eaf73d0ee4752641cde6e72f9890f SHA-256: 996236cae2167fdbaa01dedc56d92611e836ea97c8ff4f5d877d37ca0d57dca6
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://catamma.ru/uplcv?utm_term=federal+wildlife+officer+jobs PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ac0b17ba31259987d8d2f0c97742bd51/vizisinunewig.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b076c532241---3891157300.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160834276d2a02---63789729598.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xabadazobutilotoburoziwad.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/pebamexusupowipozenafada.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/femisetelosuzamo.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/87938469042.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9482d47756f1a8cb068009c6a73f52ab/43776023281.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/rejufesiba.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/10ed648e087dbfe1a2db19d6b4795525/jaretomagupusigefifiwaba.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/paredifuvop.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ea3f95b57811cb3a57dfc6efb5a87f03/22164303482.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/lsaqltms6lo4mv88acs21h1ba7/70131335111.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8bb446327---wonizefimukixobovato.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/38419299949.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a881a94055---8049382505.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0jhkf832cbu932uan7b0fohav/kenulesidexisap.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d6aa0c863e16b795df3354ce8f36673c/34509776329.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607563f2b835a---27096737673.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/kipaduji.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/k2lb1qckuv2ba5a6fcg2p5gbod/lezemapupikagobulisuw.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/sk0m9ecqbkj9ubpr80u5ki4098/35277232385.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/jokej.pdfIn PDF document text
    • https://migger.dk/userimages/file/ruvomapofuzibafedijibinin.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_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10600 bytes
SHA-256: f9c8c6e6bd213d84b6773bd2b8d11a1d2dc12af8fd8cf542c417366fab23094c
font_01_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 16816 bytes
SHA-256: 214a12ff9a66e1277f24049cd53d284c93c828f2859907f7d7488ba790d0b761
font_02_sfnt_off00013388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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