Malicious PDF — malware analysis report

Static analysis result for SHA-256 398b0c1fd4c736f8…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 21:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e66e55d17c08827affdb5771fc5e298 SHA-1: c8db92d34640a14221e52ae0269c159e1b076096 SHA-256: 398b0c1fd4c736f89c66a34e086e79a00f9dbeebe866dd454ecaa9b2806b95b5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bafiti.com/sklep/userfiles/file/dasuriwimok.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/xajuvuwonilogazi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9c6c8f15f---kenupumifeboxu.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54911249336.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790fce52f1c---68287673668.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/e7120ff17d60b57791469fee5d55d600/57720898082.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/vuvakinulajofubudi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb68fb9305---lojagetofufojawexesu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/927d7162951de9ba19ab7284673ac2a5/78621916388.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5df15a69b---33344095513.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/94008944481.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/973113921.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6d52baf51430d4d62729212254ad3474/48298052351.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210716210108.pdfIn PDF document text
    • http://heizler.hu/files/file/bewig.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/wefomavogivol.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ccb166e611d---94478772607.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1608191a44738f---68262498978.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/demivexoxokirixola.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/jajimoduzalasuwabezapisoz.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/8mldthmben2sajoihue2s0sp32/laporovamitaxe.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c5614188e09---44165086773.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/22024417398.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/33293353280.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611223efbeea1---18244847664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ultrasonic+radar+sensor+project+using+arduinoPDF 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_off0000f418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 10928 bytes
SHA-256: b614828b0013fd2cf651b5700d2fd4ad006550cdcdbf1e4f114f7c214c96b063
font_02_sfnt_off0001255e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1255E 18160 bytes
SHA-256: 6c2f322208fdca8ebd907a1748ce750bd90d7321adaa9878310c70bbaa19da65

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