Malicious PDF — malware analysis report

Static analysis result for SHA-256 df04fc650e837149…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 10:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 750d3f4be7065ab369bec3c42d8eae5f SHA-1: dbf8a69bf77aa85f79401fe3b29580871704e3eb SHA-256: df04fc650e83714938e6e9263b68b4a30fbe99b7662c6e5eab9800e2c3f27f9b
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 pointing to disposable domains or compromised WordPress sites, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://alkanboya.com/files/file///ramolomape.pdf In PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd686a0fb---desigalof.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/dirofakotemiwudug.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896cdb04e98---nigorafunaw.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/i96javdie2p2khirbe18alj4d6/gazapatatusarolowurowep.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/xodaxovoletu.pdfIn PDF document text
    • https://agermag.ro/mm/file/33273601703.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a176c500ac0---widifakagirevakokixomu.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/70420537362.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/bujusuxinimogafigijowojok.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/abfc9b528a6763633c093cb008805591/jijibujafaxit.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/xamibisuriladamaranut.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/gasuxaxufivejivavi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c7ec15c0a---sakesedir.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161136334d2ddd---kojejolileduzekirixajuvi.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/zavoxiwezuwujupisa.pdfIn PDF document text
    • https://rajaunited.com/contents//files/vowavosofuresorokenofak.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/nuwepomejatoxi.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/pemipobopejinazumesas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161274d74070c6---17960808830.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/17466693995.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/khp1jrbk5useic070vtk5dkok1/bigenogemez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+convert+pdf+to+word+without+text+boxesPDF 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_off0000b80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 10980 bytes
SHA-256: aa3060ef0f2e5d2ae911cd6ae064b28c420ddb3352f0566a50108725799a61dc
font_02_sfnt_off0000e963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE963 16548 bytes
SHA-256: d8542a2c5329db03d4ea18ee2240c2dddd06da542c2915afebd1299263cf03e0

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