Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c22aa24ae1cd341…

MALICIOUS

PDF

93.8 KB Created: 2021-07-25 02:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e03e10a5f8f5160cc5234dc4d64880d SHA-1: 23bae946b2fe41dbc81e0876ea73ccf28464cffb SHA-256: 2c22aa24ae1cd34166ee053dbac6ba28ad9be4900488f7334274757f0b549ee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a distribution or phishing campaign. Although no scripts were explicitly extracted, the PDF format itself can embed JavaScript for malicious actions, and the overall structure points towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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 http://geoplan.su/userfiles/file/jixazatavovemowekibobusud.pdf In PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16082e977de736---369846565.pdfIn PDF document text
    • http://whatdwellswithin.com/file/4349801997.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/138fab05882f603460ed5ec498c9727c/wukigogegasum.pdfIn PDF document text
    • http://zatacorp.com/upload/files/95951112972.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210725051409_1166950405.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/291b53a354e0f7f54416334d72f16677/fexadaxogudujaxodef.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/41699982982.pdfIn PDF document text
    • http://aven.su/userfiles/file/wurizuzebinesifotifagopox.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e809e89fb---28870366947.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607624bad9462---87905270299.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1c435eead---45077793521.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa073b58cdb---xojejejuvejunifuro.pdfIn PDF document text
    • http://faxik.ru/ckfinder/userfiles/files/37013869572.pdfIn PDF document text
    • https://visualarchive.bg/files/41467370786.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/2679988761.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/90302613708.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6a86a30ac---44741316729.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/maxutozap.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60e59573bf79b.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/03beb4c05edac4f6ed7e6c0cc29e5a93/dumagopuvidoxefuguroxuk.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7794c75877---80207830617.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/64675621060.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/083903f8ea58f897d27c48b37df2cb16/nixidimofulexojaxa.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/fca5b8a1f1f505ea910e026081f887e7/38237868192.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/47409205623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=mini+militia+unlimited+download+appPDF 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_off00010ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F6 17248 bytes
SHA-256: abdaea9d3f5b00495a91ba70bbc10df23e71747429c7e1edd84e7c47004f040b
font_02_sfnt_off0001519b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1519B 10464 bytes
SHA-256: 5ef13071e93e838391b809c8b7b9536fa29123aacbf6808782217b81da075581

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