Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5b1489b33688c88…

MALICIOUS

PDF

88.7 KB Created: 2021-07-20 00:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75cbc78a450b1d65ec035cc8f3d80fdf SHA-1: 6d6e9642520ca69f4e02283309de9a4e490898d8 SHA-256: d5b1489b33688c88e0f44b6efd77fbea571978a4e551db68ad14fa5c17b22bc3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF hosts a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/e2bf49bb4388c45eac1a98e0fc7b0215/lukopixikomot.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bvted10v8pi2j16f1gj7nco8dg/xawupotavobusidazivinug.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6bf34646---37874152613.pdf
    • http://www.sealjet.mn/pictures/files/21489845938.pdf
    • http://chronicles.ae/userfiles/files/valesewifadesij.pdf
    • http://hoanggiaphatland.com/uploads/image/files/37948097735.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e44409b3081---60437341553.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5d7097666---majopowepofolalazazuduro.pdf
    • http://fitviewer.de/files/file/rarazol.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b0f25ee8a---19757034765.pdf
    • http://df-foundry.net/d/files/gaberezenegopawobosumis.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/58qbn2vfdaaoklu7rgm9fthub0/mofeguruxagibovuzelexe.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609286257b010---zituriterovakijet.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/u3j5kc7n7vllikb41hn3ucrnbc/dopuworofofutiwuzowe.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a438007ff0---46210742814.pdf
    • http://mysistermyfriendministries.org/clients/85776/File/23470579864.pdf
    • http://nfc.soo.jp/file/fuzobavewilebisedilu.pdf
    • https://aviseco.ro/userfiles/file/16843332854.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666987eec7---974878589.pdf
    • http://www.urbanwaterways.info/files/44578229360.pdf
    • https://acryl-bg.com/userfiles/file/21799036778.pdf
    • https://miruyuta96.ru/admin/ckfinder/userfiles/files/lalalemejegad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=college+textbook+pdf+download
    • 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_off0000f85e.bin
452e995bcf9b5504242da06703219e6a50e2b9c81989d665f36bed6c1e04ea18
pdf-font-stream PDF embedded font (sfnt) at offset 0xF85E 17120 bytes
font_01_sfnt_off00012520.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12520 16792 bytes
font_02_sfnt_off00013d37.bin
85fce67c0d9c0872df966e97ff53a7023d0a30a01ef82969003752d39e30ecfd
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 10764 bytes