Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b103594f7c8c8d5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 10:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d9f0baa7c17313fb176cba97af78558 SHA-1: 9998e84b1da0b4af541fba9f4192487e4537f778 SHA-256: 3b103594f7c8c8d547e01eceb0642764ea8668f87af7acbbacd0317aa7c652d6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rayocazar.com/images/elfinder-1.1/files/file/68478321215.pdf
    • http://retrolondontees.com/userfiles/file/64174891150.pdf
    • https://perfecthospital.net/ckfinder/userfiles/files/89383200782.pdf
    • http://aesg2edcv.handylover.com/upload/files/mukax.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/rhdng4aaifu9f8cg862ugjdauh/75191226803.pdf
    • http://hongdacable.com/d/files/xajixosozabudefoli.pdf
    • http://greece-ex.com/images/blog/file/12248548290.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ae4cf1d8e3997d2e2c9505194a3c0d82/89830506850.pdf
    • http://jadever.vn/Images_upload/files/werodu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/6ecbf392dfb65866ec1a668efd9f7a67/bobulajanipetoxagixixames.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/utrqei3usu6gqdjrbe3jroqbq3/30272306867.pdf
    • http://restokrat.info/userfiles/file/56570594510.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134f20957ec0---90804093972.pdf
    • https://farmaciasacoor.com/site/upload/file/66952196787.pdf
    • http://abbuffalowings.com/uploads/files/96030751463.pdf
    • http://angelofthewinds.net/ckfinder/userfiles/files/galase.pdf
    • https://sibconsulting.com/contents/files/51580570354.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/96415479674.pdf
    • http://rzn-house.ru/upload/file/gexeb.pdf
    • http://gpkoaee.ru/ckfinder/userfiles/files/31465988783.pdf
    • https://cartolmania.it/file/58559207575.pdf
    • http://konyanincigkoftecisi.com/userfiles/file/roluvinubasubejirago.pdf
    • http://puntolinea.org/userfiles/files/koluxewazezotukizivoxikel.pdf
    • http://gamboeng.com/assets/ckfinder/userfiles/files/pibabotuximo.pdf
    • https://olamare.com/img/uploaded/file/55096814161.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=our+apartment+apk
    • 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_off0000c9f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F1 16792 bytes
font_01_sfnt_off0000e208.bin
021887fefb76ca316bad6a676ec60783df6db104a65f4aa1183365f643095902
pdf-font-stream PDF embedded font (sfnt) at offset 0xE208 10204 bytes
font_02_sfnt_off0000f8f1.bin
d2028aaeda6d01f217b2b596840dcdd8bdcbffc3075ae5398d39c256e8d18d34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 22508 bytes