Malicious PDF — malware analysis report

Static analysis result for SHA-256 50122a09926880c2…

MALICIOUS

PDF

81.6 KB Created: 2021-08-15 12:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 34d7de2882f65fb3f3be9ee4f5799184 SHA-1: ee7645c0c068ab12b8849ee41dfc20ce95585e4b SHA-256: 50122a09926880c270e6d60cbd2e17ddd4c9f46ffc5ada5cdeb34389405ce923
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to other PDF files hosted on compromised websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into clicking on potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://learningsolution.ca/userfiles/files/jinebor.pdf In PDF document text
    • http://churchtextile.com/userfiles/file/votonavosubivopinofe.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608e93c9c8914---75705408052.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///48490449213.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/80038196587.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1c713307c---dalimokab.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/zonoriweg.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160faed2f36ffe---xegilelokik.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/af37af74fd6a3030886e25d38a0aa13a/10499377343.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160efeddaea164---rodoxixosatomukamawixojat.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/zezamepusutekoba.pdfIn PDF document text
    • http://yjccnc.com/upload/files/22731615525.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff13a4f59---26101837938.pdfIn PDF document text
    • http://okun.su/upload/file/kurusigoxakovefu.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc4d5b41b1---vigefigomebetupebasexorem.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/22762520458.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c184afc9f0e---mexojesabovo.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/82148057631.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/25912664017.pdfIn PDF document text
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/37253359664.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9680ae962f---tovoxokuwikojadexafobobok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=jeppesen+aviation+weather+4th+edition+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7CD 16152 bytes
SHA-256: a296b1387adcec6f3b2576628ea92b3d2a56d809f0e877613436961f86b2f7ca
font_01_sfnt_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 10772 bytes
SHA-256: 41ff72bf443c8ddffd1693a3db0c2b2368f28e1d3809e77675de5f220862358b
font_02_sfnt_off0000f637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF637 15756 bytes
SHA-256: 3f560fa45e213c6f5b65930dd500fa51d47fa02d3a78d4ee832158f4ec9f37d5
font_03_sfnt_off00011eff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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