Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ee87370fbeb442…

MALICIOUS

PDF

88.3 KB Created: 2021-09-20 16:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02b47a18710d50ad410d625707708b70 SHA-1: 744af3d4683f511a8ef0b04daeceb116aa36a612 SHA-256: 40ee87370fbeb442769433fcc2d2294db2149f87d3fedf51a235a642f9fab962
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely serving as lures for phishing or to host further malicious content. The PDF's structure and the presence of many external links suggest it's designed to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+download+texts+from+android PDF link annotation
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4aabd9394---48442757748.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/wilivusonafas.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/87509522539.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gufitegumezivozagukuno.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913164558_si01ji.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/92461098568.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/8971820966.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135927831386---nabinesefal.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/49298423867.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614677cf315d9---77669102207.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/89073147539.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/83628938040.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/74466524784.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/10352633407.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/97021985490.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/c185447fd31da1f5f0da7959d6b11041/23447034495.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/velinudimedamabisemovefe.pdfIn PDF document text
    • http://centrons.com/uploaded/file/2000319359612fcf754cf32.pdfIn PDF document text
    • http://aweibel.com/Photo/file/82585740356.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/g5eassnparno8d26bkif7q7ovm/19145358276.pdfIn PDF document text
    • http://www.iciparis.ru/ckfinder/userfiles/files/94983962248.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/99653847757.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/fagakubomoguviwe.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/kaveketasomabalojezen.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tixesazeduwipuberusotul.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/gurixifafavaxud.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 16592 bytes
SHA-256: 3abe600d93df34c3561f647eab65ccf12868be72361fef182fa861a41a8d4501
font_01_sfnt_off00010870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10870 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12087 10692 bytes
SHA-256: 7bb2fabb0c3e703580d5b352bc2d228818904aa2df4c24812a66ea6af87bb376
font_03_sfnt_off0001390d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1390D 17228 bytes
SHA-256: 94e7209930c942868d8b7d09daac5721bd22751aa1b62241425b1eaa89848069

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