Malicious PDF — malware analysis report

Static analysis result for SHA-256 280ff6118ec992b9…

MALICIOUS

PDF

91.5 KB Created: 2021-07-21 16:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 079346cb4a4d028f39a5959658ad5b0f SHA-1: cd89bd7e7764beab5998c17416b659ff948efa2b SHA-256: 280ff6118ec992b962f794aaf29a72850b102e8f05e705053f9b9e44bb4ce604
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on various external domains. Some of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to obscure the true origin or leverage trusted domains. The primary purpose appears to be directing users to external content, potentially for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://alessandrobelleseveterinario.eu/userfiles/files/gadurifederosutuki.pdf
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/76770262777.pdf
    • http://resheto.ru/users_images//fck/file/fokax.pdf
    • https://aljazeerahdrilling.com/userfiles/files/93830468950.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608db7ef0bab8---mizekawamofaxez.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c91bbd429f1---nafin.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/g8gaerki4cc1s186f1js4cbail/75247629962.pdf
    • http://klefmarken.se/upload/file/98336265531.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/8ed22c8ae8a7e1fe9068025dd4a17dfe/31060760850.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b52fe002000dbcc4489253d814fbf665/17049363985.pdf
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/cb3a226744b9c62573d0c48fe47d6d5f/mibexulatakibotowogiloman.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb55637ca---43615887825.pdf
    • https://cortopolis.ar/userfiles/file/2524640403.pdf
    • http://giasuthienphuc.com/Images_upload/files/80083363424.pdf
    • https://eyetracking.pl/userfiles/file/vexarilowugametilovafovul.pdf
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/wifozud.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c1e1bfe30ea---torudimebemali.pdf
    • http://smolensk-bakaleya.ru/userfiles/file/movilifizigepetozuvadi.pdf
    • http://creativeindustries.ru/uploads/userfiles/file/vegilufetitologu.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f6043b5d---saboxeno.pdf
    • http://kaies.cn/upfiles/file/kajiwawufutu.pdf
    • http://www.asap-recruitment.net/upload/file/75991580767.pdf
    • http://paroissedementon.fr/upload/files/zepoleti.pdf
    • https://debcopharma.com/userfiles/file/fasidisejig.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f9f708ded---51288919206.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b7cf99cef---55110580700.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cholesterol+structure+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_off000100c4.bin
17a948f0f5e6e0bbfd0ae2fef8f8b42637b197d4d941b4bb577e547d2523dfa1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 17024 bytes
font_01_sfnt_off00012d4e.bin
758240f5a3691443f0c893747d82dd6f518fb62299856c9ed53ba40c52f8f42a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D4E 10488 bytes
font_02_sfnt_off00014560.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 16792 bytes