Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d40ab22c4301397…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 04:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5f9ea7e653648bfbd1bc77736662e67 SHA-1: 7fd9c6b692cb12233ac8b7df478eb807d85f4862 SHA-256: 1d40ab22c4301397b2f8fa2017556df10d38fa6bf75e394a2ad68616dad34ff2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The sample likely functions as a link farm to redirect users to malicious sites, potentially for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://audyt.rowerowaszkola.pl/imgturysta/files/ramekinupakirukugun.pdf
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/budemuwabe.pdf
    • https://wheelmartthailand.com/image/upload/File/nojawebeke.pdf
    • http://macautemple.com/userfiles/file/12712921607.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/semusirawepugokufowezu.pdf
    • https://eastoncn.housemember.com/uploads/files/lekarutazerivofobozapiti.pdf
    • https://albawadiroad.com/userfiles/files/ragaz.pdf
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/pavarovi.pdf
    • http://chipmax.in/chipmax/ckfinder/userfiles/files/89029626477.pdf
    • http://deauville.ru/files/file/puravojuxapevajadaxav.pdf
    • http://bjjiffy.com/upload/37349724444.pdf
    • http://conelser.hu/fck_uploads/file/pogisebajokof.pdf
    • https://myclubowners.com/userfiles/files/49508952554.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/runuwaxetizopijaxoz.pdf
    • https://zzhqhi.com/d/files/21665917340.pdf
    • http://mexvp.com/ckfinder/userfiles/files/wezoromojimakig.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eddb966dda---94534313466.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfb198ef4f---46484478002.pdf
    • https://wendi101.com/userfiles/file/53215238365.pdf
    • http://polipack.ru/content/file/gegunejomotakogazimi.pdf
    • http://liga-stf.ru/i/upload/files/36748663888.pdf
    • http://talentfuturesservices.com/sharpinstitute/images/files/87654536887.pdf
    • http://ansonseatery.com/uploads/files/25869182306.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/d15ee0894f1e7d08588ae796ed84bdd1/82939718321.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/zinebusisa.pdf
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/perasolemef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=watch+avatar+james+cameron+online+free
    • 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_off0000e6a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A2 16792 bytes
font_01_sfnt_off0000feb4.bin
21e95657bc0e290a04f03206b7fafa6331f9d60ec9329f919c793be28b83fff6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 18188 bytes
font_02_sfnt_off00012d35.bin
bb56b7b31e6fa856e30febf945620eb49b408cc60abd08f27c97e1dda2e127d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 10792 bytes