Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5677ed0777c2480…

MALICIOUS

PDF

81.9 KB Created: 2021-09-19 03:36:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 63dfa3bd7910a19c817fcb1bca8b337e SHA-1: a60557b539806b01d99eb7d69641abb60fcb38dd SHA-256: f5677ed0777c2480efa2e851b411062ae2164416a9dc4cdf0e2441a8f76df833
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and a compromised CMS upload link further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://crewmak.ru/uplcv?utm_term=game+monopoly+offline+android PDF link annotation
    • https://vitanov.rs/files/210740843.pdfIn PDF document text
    • http://julianina.de/upload/file/26133423338.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/57384083023.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/ladozegakuzisoter.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/10442406560.pdfIn PDF document text
    • http://njchemland.com/upload/files/xujugepuvafifi.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/foxinuzabig.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/tifovona.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/g3hu4hu4m7c8trnmckllrke7b1/xixefomefus.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466f377c165---39595115457.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/16949365842.pdfIn PDF document text
    • http://shamayachts.com/upload/file/kezumosozebonufabos.pdfIn PDF document text
    • https://terracell.pt/images/file/pelawunitisoluperuwude.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/tikisinuzowaki.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/vaberitol.pdfIn PDF document text
    • http://origo.ws/userfiles/file/zavebiwipene.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614670e053454---januxax.pdfIn PDF document text
    • https://xn--nmqu14inmf.com/upload/files/83977739776.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/54692937635.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/zufivetewosadezezixori.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/8508993697.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/migig.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/duxuxu.pdfIn PDF document text
    • https://trystsalonri.com/images/file/doxamusa.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/27913527672.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/gozeve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16544 bytes
SHA-256: 9a5c68307e2ef7e169a4f0f6035f1b16d0fc9b6d35a0a61cfcbc9791804d434f
font_01_sfnt_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 10544 bytes
SHA-256: 7b9b912f4ef1f91d1301312051f802948fb8cd94df70aca84ec2d41fafcfe419
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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