Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc490833552b5b4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 16:35:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1df161af2ebd61e87c7f6b280b105c1d SHA-1: b1597e029e05c1df58711a8b3df30446a58f331b SHA-256: 3cc490833552b5b4a3d0c8fdc8a57bc360bb8e56037c0a3d2fdd574360a9ea50
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document's content likely instructs the user to engage with remote support tools, a common tactic for social engineering attacks. Although no scripts were extracted, the presence of numerous embedded URLs, many pointing to compromised or disposable hosting, suggests the document is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08b0fc1753288e8d78da83b6f00b258f/27210181539.pdf In PDF document text
    • https://flyags.com/editorResources/file///23277102926.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/joxinuzujiworumada.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16147782e0e64b---49102015830.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/99730917071.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/zetajeraxisanatefa.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/vozavuvopugubuve.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/81821082890.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/tuvawa.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/577aedd288002adae29c271cbf1f5c1b/96836938973.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/kukafibejenapuki.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/zirover.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/zotefovo.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/13076005319.pdfIn PDF document text
    • http://scandinavia-ex.com/images/blog/file/tiforamoxiwazotemu.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/rokobeviwowef.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/74767143902.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/werukonizifefidof.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/xuzobanumonigugudutebisif.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e36fc154bd---lobajaribiwoz.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/81942329397.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/xitemipoxivedesofogexux.pdfIn PDF document text
    • http://byecook.com/ckupload/files/17935474842.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/tasalawadaxojomana.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/70608481618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=use+android+tablet+as+graphic+tabletPDF link annotation
    • 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 18168 bytes
SHA-256: 1c0ad7fb04edaea5fe30c7467a897e3e40c6e14d533f9de5e7f4a2e2c18e2231
font_01_sfnt_off00010a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227D 10940 bytes
SHA-256: 7fa304229dba4380250e7a22d7f97fcc77d4f6eeecc661b6b94c31e19b8d8caa

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