Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7fb24351a255752…

MALICIOUS

PDF

75.9 KB Created: 2021-09-06 05:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f26ecb0c695b356204a196e950564145 SHA-1: 82f7c7603a22630056e4b8188030155bbf95a1b5 SHA-256: b7fb24351a255752937bc0cc4108757baaaf68ca56eca598b827868bf4f537e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of these links and the nature of the hosting suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://huntic.ru/uplcv?utm_term=complementary+and+alternative+medicine+pdf PDF link annotation
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae9fdebbb869a189a2f0110d013cdde9/wokakofowuvetabawitituz.pdfIn PDF document text
    • https://vigiweb.cl/dinamicos/files/file/46351170994.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607174dacbb47---sifaxelom.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756390aeb11---togakisalexawugowisov.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/jigiwuz.pdfIn PDF document text
    • http://nebovsem.ru/app/webroot/files/files/kilavezexeroxubadakikojuw.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750602267a2---28784454891.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/3674f23b94adf4444bbc9ef463200dfe/76366598873.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eeb3853d0---simirifejinuru.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1610e7adaec507---rojozetekozukejosugugoruz.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609536adc776c---xerilagu.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608c615c09473---22783714315.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/87075235359.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/towonerekowufi.pdfIn PDF document text
    • http://rideco.hu/upload/file/39030531362.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/dadokusarosekogadowagub.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/77124575767.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f556ba7---pijunewilutulov.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/16d995f102a6481f36c707284dbc6b0e/lunosibukegipatuzemipa.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/l4u7kgmmmuunf7odreg827c2d0/wuledi.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/46160644064.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a93b8520fb7---dapubepowedo.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cf379751e---33241467898.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5799166568bc387527c5235219fab9e3/tavogiwazatupivomamupeteb.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/nonaw.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/pijudulizil.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_off0000c2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD2 17684 bytes
SHA-256: fe57c6a7c26267e507214a7f9c126866db9aad88246682895923fa30c0defb81
font_02_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10824 bytes
SHA-256: 21f1928cd5fbb120fbba912e64388c2b376c2f9cf6b0c994521eb95dc0738045