Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b2cd3dad3c05dd…

MALICIOUS

PDF

90.2 KB Created: 2021-06-29 13:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc6a1930e2a7bd2b50a11211a9f3ced0 SHA-1: 0e9dec6f362d680a1ae71332ea81c4022bc5e812 SHA-256: b1b2cd3dad3c05ddc20f8feb2041f06996a7b5f112f2ed7263943a05a210d4d3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://deesudcoolingtower.com/userfiles/file/sokedijepebi.pdf
    • http://aihyang.com/userfiles/file/sebiverodemujez.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/a8e57f644b081fefa339d5d76e56b4a2/52711405380.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l6g3tt08amlc44qng9lfgjc751/27891450755.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c28288d0db---vabazetukaxulavida.pdf
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/ve04em8kkr4uahtkqsaop6kit3/25099347950.pdf
    • http://taxicityplus.ru/userfiles/file/mugadijubewewuka.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0355d80ab0---19472375355.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/p0nsqp9l48vm5cv58ac3nf8jpk/97511324283.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb3b6747f---38662438371.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/82177473e1cd2de910ef5dcd533be839/koxulepasadatejemubamemu.pdf
    • http://acpiindia.com/userfiles/file/napavelotapeniwanow.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fda47e74c---28586748063.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f7cd018158dff96ccdaec3a3d52de1cf/nunulo.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836150bb45f---49344790668.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d2b4b08bef46c4a7e163ae2209ec8b7f/kagubobuvadibenet.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/27869416a68c1f5e3ca54cfc6adea6e1/86214100801.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1d738ccaad464063a2a8ad00b1940594/kopusevexojebimakukibef.pdf
    • http://nsdadventist.org/FCKData/file/rigowavogari.pdf
    • http://jngf.cn/files/file/39921004134.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f38827c0c8---zejajevaj.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=thermal+conductivity+of+glass+window
    • 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_off0000fc26.bin
5795a123ad22311a643737d94a71fc9ab5a8c06ec3cbcfc0d2756e2073e5a8b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC26 17616 bytes
font_01_sfnt_off00012a5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5E 16792 bytes
font_02_sfnt_off00014275.bin
15a9650650a46266ed1767afe9c510720389acd4bbc9f5bc9a61a86819f1f1cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14275 11252 bytes