Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcbf43c2ac144ab5…

MALICIOUS

PDF

87.5 KB Created: 2021-09-01 15:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7e1c2b262788fa49f6a93538b3d6851 SHA-1: ee74e4a3a40cc7d19f55a72a5472c77bf99be02d SHA-256: fcbf43c2ac144ab5b02e2cecd2c72f823c77775471deaf0f45d16e5c2fa59abc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of compromised CMS upload links further suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9883

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://drafthe.ru/uplcv?utm_term=about+left+handed+person PDF link annotation
    • http://ciarajewellery.com/editor_upload/file/wokakez.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/11966682907.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/jufufarojuwunifogudagaze.pdfIn PDF document text
    • https://coil.hk/upload/files/faxedawovugipunewipagano.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/leguse.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ruat8j9s6tp3dofrll76qvp9ec/98723828042.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/gizepexogapirofoxedowot.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/lubexodizixub.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2166fe0dec---luwutivomaromuwafaburu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160946c2d60e73---41234821668.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16089be0341944---naporikajotajaxeji.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/fitilis.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/dabizejapabunaj.pdfIn PDF document text
    • http://garderoba.sk/images/_file/tilaxagejukumuxafatagam.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cdc4269e2---pewaxisawebawirasimetizu.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/45782194966.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/65045084559.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/jukalotugagipasakotasozis.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/5cpp4heualjclu5p10ka7bjll4/zadudizexino.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/aefc13a24705630df73ed8d3f4a96177/rebomeloxetize.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c376b306397---jejiseje.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/netabamokel.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/td1jiof3nkucdhr6frijjj18ko/gadepozutobezemumu.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bac803d4d1309bce3f9b00e4c5319123/dimoxovixoxiwup.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/4aca12b90e51d504ef0b6e61c1c2e75e/welowuwakogosupilod.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/9878580559.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_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 18256 bytes
SHA-256: 6c4bf497f1b9cb2f2409f4edf9ff7b1b6e14c129aaa1462503f987b7114638dd
font_01_sfnt_off00011eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136CE 10724 bytes
SHA-256: 7919a714635b5cdc247c5ae899952a8e5258e96206ea3116494185b00f397daa

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