Malicious PDF — malware analysis report

Static analysis result for SHA-256 75ffa01258a2f913…

MALICIOUS

PDF

79.2 KB Created: 2021-10-10 05:24:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a224f84c4f322f2b90a579e5ce691e1d SHA-1: 71d6af67ff16a25462c9295ca516cb31786fe986 SHA-256: 75ffa01258a2f913341a0fae687e3f83a2a103876584bc9e981d6a1ca9e39c93
204 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Embedded JavaScript and numerous external links, many pointing to compromised or disposable hosting, suggest an attempt to redirect users to malicious sites. The presence of a PDF link farm heuristic further supports this, indicating the document is designed to host a collection of links for SEO poisoning or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://zzfcw.com/file/fkimg/file/bipazemefiwufevi.pdf
    • https://anvatsaigon.suzukihungyen.net/data/dulieu/files/daregegepegosenakirexox.pdf
    • https://alquimia.in/admin/fckeditor/editorfile/rusoxitam.pdf
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/16458300245.pdf
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/vibunizuzobewawiwepitosu.pdf
    • http://4reality.cz/userfiles/files/wezepusofenoze.pdf
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/rubetomedusejarafopig.pdf
    • http://jshanwoo.com/ckfinder/userfiles/files/pufuzidatu.pdf
    • https://kpii3yaw3-7nc.com/contents/files/24458507241.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467d3a901d0---xazugivotejiwumezi.pdf
    • https://khabul.mn/mmpa/userfiles/files/legonifor.pdf
    • http://whkmradio.com/userfiles/file/jobusasef.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/66a6564167ea8be906a70bd55eb55649/79107210169.pdf
    • http://wijnhuis-vaessen.nl/site/data/ws/files/22856691998.pdf
    • https://museuminiaturesbesalu.com/files/50233530487.pdf
    • http://ipea.kr/userData/board/file/libaper.pdf
    • http://luckdidea.com/ckfinder/images_store/files/zavixanogavuwexugalox.pdf
    • https://tch.lu/files/files/gopojirefepuzemesuwo.pdf
    • https://vyaspublicschool.com/ckfinder/userfiles/files/56126923115.pdf
    • http://charmingcurls.se/upload/file/lezij.pdf
    • http://phongthuyphatloc.com/luutru/files/wewujodogakefowe.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138a1f6c1b9b---gifamijiwuturefi.pdf
    • http://daiquangsico.com/img_duhoc/files/fejapovodesunogodozijuv.pdf
    • https://adesso-moosburg.de/images/file/vunelel.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1616196706d105---menevovenokabob.pdf
    • https://timminsrenovations.ca/file/a4qZAElD7Hcpj7RL.pdf
    • http://phongthuyphatloc.com/l
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=difference+between+laplace+and+fourier+transform+pdf
    • 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_off0000c8d2.bin
f0144d3ad484aa55194b9284fed914a792665f839273937f69153e0a29ed1740		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D2 19804 bytes
font_01_sfnt_off0000fcd9.bin
3a4e2c16cb33e45d07a12c74f2c8208d1b6821f49ac4d0190217114afa4188a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD9 11108 bytes
font_02_sfnt_off000116a0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116A0 16792 bytes

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