Malicious PDF — malware analysis report

Static analysis result for SHA-256 23b36877d67d613e…

MALICIOUS

PDF

91.5 KB Created: 2021-07-03 00:56:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54df4728b8db0119fdb529b8d95e4fa7 SHA-1: 5179af2c8dcc66a7a87fa4303d528380a0de53db SHA-256: 23b36877d67d613eebf6956f0076f3a9e86966d648ec0e5604c5d2033670ef35
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure itself is designed to redirect users to external, untrusted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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 http://nct-vn.com/userfiles/file/84590791650.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d2cf26ca6---94882595781.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c464807a0b1---mezugidipem.pdf
    • http://biswasi.com/userfiles/files/lokiwode.pdf
    • https://tourpon.kr/FileData/ckfinder/files/20210624_6AC70B68E78F92DC.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34c95284b---ponisajaler.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc88048b8---dedizibadexebodawomuf.pdf
    • http://bannails.com/fckeditor_userfiles/file/34845665303.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607498cbc84c2---79321514683.pdf
    • http://africa-emergence2019.com/userfiles/file/bukegiposun.pdf
    • http://learnersdigest.org/userfiles/file/91902586365.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/90jadiejbhq6d950qoa9o1q1u5/86549420233.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1bb400c639805b91bb16d9646e3e9d5a/95805866724.pdf
    • http://peaceinsrilanka.lk/userfiles/file/demitogaretomun.pdf
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48efbc2d76---dexaxupavevulo.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a029f3562e4---24142325288.pdf
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/c2d9b27084a7ad8ebd95e3a1c89f8508/95616158598.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6417e766---51992806947.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cced4b0e212---dabalozofujimolitubi.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fceab00f7b---49277593818.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f30edd94a---1286757248.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e05430qmnrlup8ae9ds6k15ioj/dovunezuveg.pdf
    • http://studiolaviano.it/userfiles/files/46924901370.pdf
    • https://bouveau-consulting.com/userfiles/file/virumagubatut.pdf
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/85095a39b3703c9c93b2826fe8aa0a17/33808760038.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48a782b3f5---76809878927.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f71400e04---93052179294.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be443f6a9ae---90548797850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=strong+smell+after+sex
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001016e.bin
64ba021769e44f1c2cad131b55df4a61c07c3ca162b55ff36f40255df6444bc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 17168 bytes
font_01_sfnt_off00012e8b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E8B 16792 bytes
font_02_sfnt_off000146a2.bin
01f39c5b4ba04435fdffc3ea07ffb01eee13f470bc7d6604e99844a06a3caeff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146A2 10640 bytes

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