Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0d5d153af08956e…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 07:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ac9ee571ec5aa638ff6647a9ee4e8a5 SHA-1: 843a0e6fdc2a1da3960c63950151423a02298d59 SHA-256: a0d5d153af08956ed24fc4a2e965d60033865ee83b1cb1cd14de60a93f6b3a4b
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, embedding numerous URLs that point to potentially compromised websites or disposable hosting. These links likely serve as a lure to redirect users to phishing sites or download further malicious payloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://huntic.ru/uplcv?utm_term=graphing+slope+intercept+form+word+problems+worksheet PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/d0a349d462b1c45487540c2b656c4310/pixax.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/ximilijuwedajijutezavu.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/wifiwenobujutisim.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/84911476953.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/a6b88807839e1064a6a260bedae24344/soluluzewenoxorox.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f0ec0b94cd---7550658154.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210611154801.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/47688271997.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/situlokewevinobuki.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886eac228d9---52821167956.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160be5d0d4d94c---74713814436.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee34ac6ab90---jelofipelasukisubeji.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/02nb0m79veeeeiff0vlhl3h845/63491439650.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf4e2bf546---sugigusufaganijegozozibut.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1621351784313978504.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/66385729323.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/zatawadanubujav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e98078e2834---zawijifetufepibiwi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6fb9a1795983b212ca336d03fbfa605f/vurap.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/nivipise.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/87185094498.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/4644975669.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/63286359670.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD75 11424 bytes
SHA-256: f4ea0bbe2c644b00eb6e649cbc8c67e2b904607eff48d7e0b671dcaee717ea4b
font_01_sfnt_off0000f7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF5 16308 bytes
SHA-256: 5859801142c12b5b30fecf68d2c3e250909b5b6578bef4b4d6812017cede4860

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