Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbee2044b0b1525b…

MALICIOUS

PDF

82.3 KB Created: 2021-06-19 16:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3bd741a5fb19b9f03d0bb11105e109d1 SHA-1: 2d333f495e144c56563058474673ca7b7eab1508 SHA-256: cbee2044b0b1525bb726f06085f555d1ece8204ac4a97fbf005025d36b47e0ab
196 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to potentially harmful content. The presence of a heuristic indicating instructions to disable security software further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087a959ecef6---tavusazowuvisagi.pdf In PDF document text
    • https://marljivo.hr/userfiles/file/nosalabiwuvasuba.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/67c7f3bce6e0b5085add0fa9197d5009/pilupejalavex.pdfIn PDF document text
    • https://andrejc.si/files/file/25299525226.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0859ade43569fc1e16c02595289d9924/gojuzuxobofusebeseso.pdfIn PDF document text
    • http://alltechsro.cz/files/88249074816.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c67e188d4a4f22311a8b803bb580f9e8/18256610403.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/fixumafefamedubunulage.pdfIn PDF document text
    • http://fitviewer.de/files/file/jibex.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-27/20210527153248170297.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb828a35a9---37806362262.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c35d14d1d23---41575384436.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c0bc0dc498ddd2cf47a0b5a69261e08c/dotezurilejekesazawuwuk.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/5198e8ee3f006ab5dd7bfeff79686c27/kapugatasoxano.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/b252827439911b35d245e3b71dc4b1ab/99946402861.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5farrtdeh09f6252idql06loob/55864423246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=nfs+most+wanted+2005+requirementsPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 5064 bytes
SHA-256: 313ae02bfee634876f9ac0a57d65cce049eb9bdb7fdd2598d25d6329c26de0ad
font_01_sfnt_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 5604 bytes
SHA-256: e030a82c56279b5b1ecc9a2b94e960d0150d4aaabc74345698b2fd26ee0caed1
font_02_sfnt_off00010108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10108 7084 bytes
SHA-256: 130c065ed36e2a87f94bedd7982a750c1de19903a03f366a3037419f9ff82bce
font_03_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 12376 bytes
SHA-256: e23bacf7535b8b911892fbd866ceadcd5958884fc01073b97fb11049013cc5c2

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