Malicious PDF — malware analysis report

Static analysis result for SHA-256 1783613fdff1b65c…

MALICIOUS

PDF

89.8 KB Created: 2021-07-21 23:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 44a9167227a941185edd481969fa753b SHA-1: 92a1d96166ed6e842daf75bd11f171b1709eea49 SHA-256: 1783613fdff1b65cbb14b3e060682e68981560752e4031ce25f617d3204e257e
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal that the document contains a link farm pointing to compromised WordPress sites and potentially malicious PDF files hosted on disposable infrastructure. The presence of a 'download button' lure further suggests an attempt to trick the user into downloading a payload. While no scripts were explicitly extracted, the nature of the links and the overall detection suggest it may exploit PDF vulnerabilities or lead to further malicious content execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf8c956ff---70044851921.pdf PDF link annotation
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/8b2c50e4b56ca356fcb1b9965308a47f/48969205177.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/23358610896.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb5922af0---reveworexaxoruw.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111e650622---19291484621.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/vanojiwenaxabitofojepenu.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/barijufuravegap.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/54924767567.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16078c0527b591---43972027686.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/83948001241.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff506eded8---sigezakolomej.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/sojewibolitomamil.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/20223935079.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/101605933.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/hrj6hgnill6v9o4ilj9r8k03mh/jafufazobuvoruvodijor.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1f8dc0e038---1877145089.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b9aef94a---39424503244.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20217152359417335.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/65267755042.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zogibu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/j1r61g7g50cr5c49ok5c6fk24q/pozenumifijijimejap.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafe279dd7---mopuluko.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93078332899.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fd0ae299c---15223397737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=supersaturated+solution+poemPDF 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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 17564 bytes
SHA-256: e57fe5ff45819332493e7e4e51f5d3f02f6c04a173562edf52fa1558d2229853
font_01_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 10728 bytes
SHA-256: 8a5b2362806a5e244cb564cf48aecf267e3c84d32884f58a24197770f34a16a6
font_02_sfnt_off00014004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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