Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ab5ebe0d7d5f7f3…

MALICIOUS

PDF

70.8 KB Created: 2021-09-05 08:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1ce07eabf20d6a296e3818d5ad07edd SHA-1: f41f5116a69dd718b9efd24e6332b8ba05a1eaca SHA-256: 4ab5ebe0d7d5f7f36c89e89dd52e45289b247ff65b6149c4d7c4d6c824f35fd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://arrad.ch/modules/ck/ckfinder/userfiles/files/43939627787.pdf In PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/taferinudunazage.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/84612119729.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecf7cce595---79726047131.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/fizuw.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/11685674936.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/569654c42e3d982d3d13047c9c955eea/segawositubim.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/vasorobis.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec1bcf9e2---mimokokewomegir.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/wuxuxawamegiso.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/niwifuki.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075c009e86d3---73728493844.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/2011704424.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608882c10e9d7---24580861948.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/c07b408c205c414215c952724b65628b/tisubinukadisa.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/xotupif.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6l3lced67k66hfjasnrg73k91k/97843325799.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/06-19-02-40-58-66.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607866a94d8f5---xibolaxarej.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/buroxiwozumuraguk.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/xometorijonogevan.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/47aae79917d271228dbbb83088b4d9a7/kulej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=arturia+matrixbrute+manual+pdfPDF 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_off0000b38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38A 16900 bytes
SHA-256: da969de9c9fc763ec4660c312f571a1b91ce6ceb1a63dc0f3c00d2387e6b9888
font_01_sfnt_off0000dd02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF519 10692 bytes
SHA-256: 826db1d9f992ddb17013fce676731f9e311a69db27159e912b413412b00c80ae

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