Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac96601a1fdbb36e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c85b9189758f41e14e9fcb7b9e87576 SHA-1: 827f893e0f5becb3d7a631649694c75b5824d403 SHA-256: ac96601a1fdbb36eb8cc708e0b5a5b5cfa443c385a3989fde410071c2fd6149d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of numerous external URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://gzhangqin.com/uploadfile/files/delinupogerimu.pdf In PDF document text
    • https://profession-your-dr.com/uploads/files/202109050914547879.pdfIn PDF document text
    • http://malifer.hu/upload/file/matax.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/nevaxunozu.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/sinuxevobodaxisomi.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16135db335e27b---nikafunonedowizawekaw.pdfIn PDF document text
    • https://windsbs.biz/files/file/3496772834.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/31188665842.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/9485488512.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/62966756895.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/wodamadogazeve.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a26ef1acc---xagazuvup.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xatevemosuduvudeterulezer.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/82290825057.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f06ed7de12---86088066557.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/76402510109.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/98c2d84dcf1a8455d015973517766242/56481797996.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/tasufarexevonazapavi.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/welapamowudutu.pdfIn PDF document text
    • http://fourfoods.com/images/files/87255021717.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/35425080241.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/valamojuzabugoxaxaxo.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/mudemerixa.pdfIn PDF document text
    • http://primethailand.com/ckfinder/userfiles/files/zavijovalodarogene.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/23739389096.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/bebuxekawabilobex.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/31067687238.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=sully+movie+ytsPDF 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_off0000cb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB07 10256 bytes
SHA-256: 5100d57d377476b6b99a2e6cb3e9918e84f67ed4127a82fa166ac9d071ebf48d
font_01_sfnt_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 17860 bytes
SHA-256: 258a7d7c9e7e99998558ce5d23b25113551818a42bc28b44e75274cea62ecc75
font_02_sfnt_off000110c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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