Malicious PDF — malware analysis report

Static analysis result for SHA-256 3431c0bf6fdfa2ca…

MALICIOUS

PDF

81.4 KB Created: 2021-09-12 21:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bd6d08492335565807c6da8ab796f85e SHA-1: 53e13169890d316a4798336f202323101367c353 SHA-256: 3431c0bf6fdfa2ca776cdf57644fc69b853c84f7ae2e49168b5769992cd5359c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the execution of malicious code or redirects the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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 https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/57c5259b51143dbe79e94c78392d6f6d/81848790447.pdf
    • http://micronforgacsolo.hu/UserFiles/file/89200393064.pdf
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/59371883833.pdf
    • https://mosallaesf.ir/uploads/ck/files/sitalinudegi.pdf
    • http://summitremodelinginc.com/userfiles/files/82677314478.pdf
    • https://matricula.netlandschool.cl/files/sodomazorujexusavufotuza.pdf
    • http://aolisenjiancai.com/data/files/bawifudunekuso.pdf
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/10417151689.pdf
    • http://chukysovin.com/img-svc/files/xunusuvoveditanubus.pdf
    • https://sofupingame.net/calisma2/files/uploads/tofatavorakoj.pdf
    • http://whatcanidoforyou.eu/publish/file/94303462503.pdf
    • http://tabletopad.com/images/file/juzogag.pdf
    • http://mamolenasnc.it/userfiles/files/xafuwugeruwedamojuvabe.pdf
    • http://astmasme.com/userData/board/file/lowigidajav.pdf
    • http://wuyioutdoor.com/userfiles/file/63337221912.pdf
    • https://desco.scp.hr/files/xebuzavagi.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/6463119416.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392a7d63278---labodoxikitopagegoropisig.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4b097beb---peselol.pdf
    • http://semanbio.com/upload/files/39471796548.pdf
    • https://afma.pt/site/upload/file/piritakagovojud.pdf
    • https://cvsc.co/userfiles/file/30344336444.pdf
    • http://caramelitos.sk/files/lonizitaraxe.pdf
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/71551239090.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=mobile+mortal+kombat+cheats
    • 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_off0000d630.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD630 16792 bytes
font_01_sfnt_off0000ee47.bin
a52a1bdfdc333e6879923d846bfc00cc9cd63edbaa79cb2714f5ddb4655abab0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE47 10616 bytes
font_02_sfnt_off0001068e.bin
b688b6da1731a6f476f20596a92963817644d53cdb250a8fcf12e89cded68fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x1068E 18968 bytes