Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f5a8d3968583ec…

MALICIOUS

PDF

95.3 KB Created: 2021-07-14 10:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d2a977497afe7be60c45ac77ef4c5ba SHA-1: a107f2c6ba6553e3e8f0bbb57d1c0b6ec241c92f SHA-256: 44f5a8d3968583ecaf5e7a5938e7049adf42c19b8ecaf7eaca1cc3658a8b69f6
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress upload directories. The PDF's structure and embedded URLs suggest it is used for SEO poisoning or phishing campaigns, directing users to potentially malicious content hosted on compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://jingluo.net/uploadfiles/files/reribuxi.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c89480a91---64341435489.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/aa1897a065bb6d363df6ffaaa0ccd1a1/98391838865.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/51148087034.pdf
    • https://vildmarksjagt.dk/userfiles/file/wudixik.pdf
    • http://smflow.in/admin/uploads/file/maguvigupeveseb.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/t19vcgl12a6sekt5kapmvc94p0/nusidogonikawepiwalipux.pdf
    • http://www.fonfe.com/uploads/files/jelixofal.pdf
    • http://coinproject.com/userfiles/image/file/77790106358.pdf
    • https://digireg.se/upload/4856559879.pdf
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/zifixodovirixekajo.pdf
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a0549c53---rojunibamipepikutelu.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d0125d9a003bc559cdcc1ac5c075edaa/kubemafijotowino.pdf
    • http://t-eamplus.de/web/editor/files/zolunuj.pdf
    • http://cn-junsheng.com/upload/file///2021629543264.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/f467f8ba93e0953b67d0ca014a98aa54/lajawofisorelivirizev.pdf
    • https://agatanorek.com/files/file/wativutibudumipa.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/61bead282d21cd4981566812f9932c2c/wojaxosarig.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1f6ba7f6---81352620003.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b091deca814---vesenefemisirimita.pdf
    • http://app8itebarandgrill.com/admin/images/file/82260965592.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/foleg8an4odg9j3sn9u4c4p7kd/13311461024.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ub0g3fd3lqabokus0urbg04sp1/wamawikosezimut.pdf
    • http://afgventuregroup.com/cfiles/file/82884420200.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ideal+gas+law+equation+example
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010dd8.bin
86b2973f5f43e2112d8511d14bb6967a5d63e6ba0d3a7494e72a5f6b67ba8fc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 11020 bytes
font_01_sfnt_off000126f5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 16792 bytes
font_02_sfnt_off00013f07.bin
b72332b4e01ddf91bf108fde9945cb5c6652df118f3f4afb6dd45737decd66be
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F07 18304 bytes