Malicious PDF — malware analysis report

Static analysis result for SHA-256 077b0550e2cfa46f…

MALICIOUS

PDF

88.8 KB Created: 2021-08-12 00:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 2d87ad5750611dd74e613e340a110e0d SHA-1: 60a97db671c7b90f1eacf054ad57f576517d98f3 SHA-256: 077b0550e2cfa46f8323894995a9868dcc3ead5993cc1a0174a0a0d4cff96055
156 Risk Score

Malware Insights

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

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, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/i2ehe8nqij3chpcbph58isgge5/14648477823.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/16bed7c3d970373125f000c934001162/34888725123.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/zevinuzorufovinuvamo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/47daa8784b8bae3f2124c9d1fc97496f/jokesabekofeborazebilaf.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/q884oqrr4prl82vhr3u41gb81u/mupamum.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/vagobibojevozo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/839d7920fd17ea83a3ae0047f1692da7/vuvalezogujig.pdfIn PDF document text
    • http://clubsahdianagalati.ro/upload/editor/file/topufekuzibuj.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/98868145261.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/legawokumi.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/17582838386.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/b19e37aqii2258oiqv81feidac/95962722172.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda97b3af7---tavibof.pdfIn PDF document text
    • http://pinxedien.net/upload/files/61966024578.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/gaxikiferugig.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608565ab6cbbc---mudapubenebapi.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/xabagesedifilafufisapota.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/b8d52867f31c5lmpaktpoqofo3/3329327724.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/01b01662bfcf00e381ffdade0b698180/nufesakibavimemosofanu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/icdcmcmt6o0qe858bccnc3vr32/wujeb.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/88fd62bb91e4fb1d7afa231105d84cf6/vusosowaverixalilusu.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b27ac62e1---22236554593.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/8e30d9f5edfa02c16e3f230687e20f33/vobamozudiwekiraxisajiso.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/poletuxiwufajazexis.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efe6ae45ddf---rabezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=equilibrio+rotacional+y+traslacional+fuerza+y+torca+ejemplosPDF 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_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DC 11316 bytes
SHA-256: 85e5087e5cd0ada6a3609b2a1c2610560c4a165d1339fa564e2b6b490e826cf9
font_02_sfnt_off00012342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12342 18228 bytes
SHA-256: 5bf2d3d6a555a83aae2c6d54790cc4301f0e48fdec5c015ef91827cbc52cd061

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