Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4ba51460d17725…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 04:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 75902e60f411f8d868576ca4c04aa219 SHA-1: 53a4eda1e162b3d6e95c6b784d82090487ba93d6 SHA-256: ee4ba51460d1772583f16f3277d64bca15e6c603faea9311d6110fc0c81463be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external links, many pointing to disposable hosting and compromised WordPress upload directories, indicating a link farm designed to redirect users. Embedded JavaScript was also detected, suggesting potential for further malicious actions. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prodottoitalia.eu/userfiles/files/60101295256.pdf
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/zuvotikixutumemok.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c2d8d57d6---bibulunivizivekeda.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a572ad3c1ff---ferakakuzetakorub.pdf
    • http://asea-admin.com/_userfiles/file/20210624180432.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860ff7e4907---mevemufirovidutawesojox.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8071608e29e8300f3b800e23cfb0f65b/moxawutosuf.pdf
    • http://asianmosaicnyc.com/userfiles/file/64157813965.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b3da0b08.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609867e76b3e6---pijaxu.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a0b1fd6c---dazuvojimumalubevedopeje.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/maxobutamala.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/15f325adbda1088b93f5ec2b35bc8f0b/tunenobobobitejosemeleg.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c60a25a5855---dugulexakekolenalikifa.pdf
    • http://davidhammerstein.org/userfiles/file/gumedosijixatuzitituzebit.pdf
    • https://soyana.de/js/ckfinder/userfiles/files/jomifabapuvopi.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c0765ad7---fuwofabijelurusadope.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/43e7f69c1492353d6af746bc36375225/44476623290.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b64dbd5bc47---31840022360.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5cb1f3523---limojixamowas.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16210964264536.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/5vqj7mni2b5q6qi25ceqksrgeq/37481334379.pdf
    • https://agentcctv.com/userfiles/file/rejiv.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6erh88foth08nnboe1dumiol0p/17835569048.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=neuro+ent+specialist
    • 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_off0000f6e7.bin
7865683e6784aa921f5308f1439a5fe3b721e190cd0635a151b81d68803c13f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E7 10444 bytes
font_01_sfnt_off00010ebb.bin
0f9a48ee87a40ece454e671b4353402084583507c1a94cedbd7418c5fd0cce5e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBB 18484 bytes
font_02_sfnt_off00013ea4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA4 16792 bytes