Malicious PDF — malware analysis report

Static analysis result for SHA-256 d35ed6a224db4878…

MALICIOUS

PDF

95.8 KB Created: 2021-06-26 02:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c49115269282071590f1eca06f706e0 SHA-1: 627fca5a62964c137cc5735ca9b0606197b519d8 SHA-256: d35ed6a224db487864eb0ac0cb0cffea09ffe0f3557d3c703e7fd0aa84e6da8a
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://juvelyrikoscentras.lt/Files/file/88430054207.pdf
    • https://cam-ceeds.org/ckfinder/userfiles/files/kanogivapazejadebeloz.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608871b9cc1d3---13162903046.pdf
    • https://anmoul.com/userfiles/file/4060761550.pdf
    • http://www.urbanwaterways.info/files/20278762463.pdf
    • http://apluskleaning.com/admin/images/file/wesonamerovafoxutov.pdf
    • http://www.knickmeier.net/images/pageimg/file/miwavusipinabuwogojij.pdf
    • http://allmedicus.com/userfiles/file/wewinilatijod.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607686c5e2baf---vesarozunosapopuvatod.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2506cb0334---gixizexavejulu.pdf
    • http://karunb.com/UpLoads/files/7021830315.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/26753225711.pdf
    • https://luminex.pl/upload/file/jetopabimadozel.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608637f34055c---73703764832.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/1ktl7l6p32us0asbth076ccn5f/femozeremavodogizelufulek.pdf
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/ec6d36u56o2n24inedjfg5ikul/dizokepatekiwoguledo.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc2e03075---95655340733.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed683d964---tefofifuzuwabejamu.pdf
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/t7v81kdvlmndlq8f9rmgnl1r16/xuritojotetabusegolajizut.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e991d6a0655bdbdbc3c8a883231e4e9a/23083851307.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/891ca3ecd23136c508fd8c70788a9140/kozuliwadet.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/0c13d6720bebd2ec557a68a9b64dd0af/sosazaw.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=two+solid+cylindrical+rods+ab+and+bc+are+welded
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013e0c.bin
cc571be28f916f98d03054d8dfad43b82b24320432c318b0a29e763839ad1fc6
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13E0C 19568 bytes
font_00_sfnt_off0000eabc.bin
d09a6cd9c63e61976a46af4e91a7d2595158a40ba346fe147996057c1da3e6cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEABC 10568 bytes
font_01_sfnt_off00010307.bin
ba28e5616e8d35f2e8262e64e1444d1bda69e781cbcea81a2e0cca8f0c0ad26c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10307 20576 bytes
font_02_sfnt_off000125fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125FA 16792 bytes