Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac3e6399326ae802…

MALICIOUS

PDF

90.2 KB Created: 2021-06-25 21:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 170171157eadb1dea0cd563e7973e601 SHA-1: d0b925bba3a8a3e454022708801c9893944e86c9 SHA-256: ac3e6399326ae8023644e32d6ff2bb44e8068b34964cf2ffa82660ecd19287c2
196 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many hosted on compromised WordPress sites or disposable domains, indicates a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' firing on 'PowerShell -NoProfile -InputFormat None' suggests an attempt to execute commands, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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
  • 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.
  • 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://irlanc.ru/uplcv?utm_term=ifruit+app+for+pc
    • http://atol-res.pl/uploads/file/81454128289.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31b718699b---38849180651.pdf
    • http://xiaohecollege.com/d/files/26484044377.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210605015604.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/73hedtb0o0um78ch09ackfuk9f/11821568894.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ef34fa8a54e4a98f6fd215e7448d5139/41982853138.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0204a70b34---gemelan.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00eob4vtn8se64rbp7lbuvjct3/67475253523.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/8mio7guol6jgge9lcng4r64fdn/rupisazedediretol.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a04246b13fc104c21f196c34268c819/8062198598.pdf
    • http://e-district.org/userfiles/file/91023365768.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23d23c495c---xotuderusuvarujama.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a813b65b3---lozutim.pdf
    • http://ajivikafinance.com/userfiles/file/45875628864.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/35e62f32b4fdd898077f9e3d4a166b24/59317198480.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a405ca7ed410000884b17a8eb2e602c8/13308836065.pdf
    • http://kyanite.tv/userfiles/file/24332131333.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/88769141417.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a331a4255ca---26984637214.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/989815fd0f9d99b64a831075dee23795/gapizubupugosomuwajimitu.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca65dae816---mobatojoxuxeweliwofij.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/167258sd1f1f6krddei05jba04/3598380197.pdf
    • http://aucoindeshalles.com/menu/file/malunipofoj.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_off0000f9d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D2 16792 bytes
font_01_sfnt_off000111e4.bin
333852678d35140ac04ccb280d77aa4bb0446c090e658e90810d0788c5729c8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111E4 19024 bytes
font_02_sfnt_off000143e0.bin
af891dc1e9dad4e4b2bed7237fa39e334aca9216e6695a2642969dd668499689		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143E0 10076 bytes

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