Malicious PDF — malware analysis report

Static analysis result for SHA-256 6420715961eb5a5b…

MALICIOUS

PDF

77.2 KB Created: 2021-09-03 05:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70c87250c971fd4423ac013749e138d3 SHA-1: e111e67a0e8971decb41185193076103371177b5 SHA-256: 6420715961eb5a5b1d01a5f0a05a973d7a19a50e440d8ae4d50071b333a875b7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used to host a large number of links, potentially for phishing or malware distribution. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 7

  • 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.
  • 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 http://thankschicken.com/uploads/files/kigowe.pdf In PDF document text
    • http://ourgans.org/userfiles/files/vigukanexijudurizomefenu.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/fanukamet.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/14504800549.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/1bfc5783f97875689d370a2a1c737ce0/lopotagugobuxafowewuj.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/efd193c59006cc22281c4f887def7216/14034212906.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/jumenelaragabinomow.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/pigabomogafirotuf.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/fobinif.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/0c353plrul253ipc9j8601spt2/kidikakulanag.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e11b2f7cd67eda81404408c369f117f9/gibetalomisixelutokom.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/figopubagis.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/09d4333c19d331f51779f074bf40da0c/bajatinekuromuwix.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a68884d5d---69605159362.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9795035b---31131266595.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216519366929.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/48377525876.pdfIn PDF document text
    • https://alutat.com/data/file/juzazemavugedonubatenuv.pdfIn PDF document text
    • http://austria-ex.com/images/blog/file/94632009381.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/62695401198.pdfIn PDF document text
    • http://thuexedanang247.com/uploads/image/files/56233544569.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/koxeragibirunuzibixodi.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/nabokik.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/d91343c900a6877ad4ba7cc1878184e9/wivadigino.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/rukutiluxakoxuxupubakije.pdfIn PDF document text
    • http://ahs1966.net/clients/f/f9/f93f52488d971b5f2372adc2bdb16541/File/80315813355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=monitoring+and+evaluation+training+manual+for+cbos+and+ngosPDF 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_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 17128 bytes
SHA-256: 2fb23884bc6ceee1091c45b21db8422494066097bb75dff8394055e2502d84d6
font_01_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 11120 bytes
SHA-256: d34ac03fe934d6a3541226b7f839c9664d7bad8b664b10476295bbffcea3f667
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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