Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d17e17328e418e…

MALICIOUS

PDF

93.8 KB Created: 2021-08-06 00:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a2f9c7534ce12d3f0fdfc7d6dd4b6fb SHA-1: fe7bb8f2568309f3f0107e77c534fc5894a2de75 SHA-256: b6d17e17328e418e094a0680bf784078b206182edc92ae30a1cd709d551baf01
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096654525829---lobosefubuxikoxak.pdf In PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/xavaj.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3f8ccdcdde993f1b3fb478a435889ea/xogajukajusi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/25771692979.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aa71ee6a1---nirafulaxepugoke.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/cjmp578i9jvm4u8mbh75t9338o/pixinubodulozunanodeverut.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021052215242920.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/0isfc3inqeebe69n0jijfuq9dn/8957910441.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab10d88d9a1---saxemopeliso.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/pujosemuzi.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f031e06d783---genoravubefovarulaxi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/71590549450.pdfIn PDF document text
    • http://svx.su/ffile/file/10386696565.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5b40092c0eedf7f385fa12ea3af9ea8c/vagilodo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/da474876296e08b0ddce821a6cf0033b/fokiguzunupazut.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0b70046bb---xonadozaliwefego.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/lasusavizi.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/71886097337.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/zewal.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160741e18ea1b9---zukidomudotukafi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9b21ec305---74259564602.pdfIn PDF document text
    • https://tmtteks.com/files/11559405063.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa033003c02---1266256207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+turn+down+music+bot+on+discordPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000eb94.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB94 18868 bytes
SHA-256: 7f49cc5153c56447dc1faae9805e7e05e374625d935a6c251060878d3be194bc
font_01_sfnt_off00010a45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A45 17068 bytes
SHA-256: 70bfc4776c728d35be0ca9c5e732b8f5b612aae51a4684539af6afcf1cff174b
font_02_sfnt_off000136d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D2 10508 bytes
SHA-256: 408a03ccb5629d17211523320f6f2738f79ee0a7ddbbb8591d734f79d88aeddd
font_03_sfnt_off00014ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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