Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc2303c6f495b1a6…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 08:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7b23e9ce4d7ad7ffaf0caf2946985624 SHA-1: 95a7d7202a289a22e4144762878467d29fbd435d SHA-256: fc2303c6f495b1a6138531f353e7909bf9ce5ada930256f66092daf7df679352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs and is identified as a link farm, with several pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://pixomot.ru/uplcv?utm_term=truecaller+apk+online PDF link annotation
    • https://feldmann.pl/userfiles/file/42352560397.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/80645995446.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/95874653757.pdfIn PDF document text
    • https://aokman-drive.com/d/files/xijijilekavojonexigatutib.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/74559881559.pdfIn PDF document text
    • http://chinazzjx.com/d/files/71340338663.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/roxom.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/gonalojurizi.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210909_6B73D47291347879.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/12083445061.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/21780455860.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/77061014292.pdfIn PDF document text
    • http://art-ball.net/files/file/kodoropipurigafi.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/90179041394.pdfIn PDF document text
    • http://status.cz/UserFiles/File/xexuzupumaledunujo.pdfIn PDF document text
    • http://kraemer-duennebacke.de/files/file/37969265196.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140d30d11337---gejawemeradivaxikebeguv.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d97b012---xixulimabivixujinunewe.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ksgmk1cc632kff02iv67qv2smj/56176890.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/japas.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/13686063125.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/fujibigaleputun.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/49017948085.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/nopaselajogiwiwuxa.pdfIn PDF document text
    • 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_off0000e79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB3 10256 bytes
SHA-256: 5480ac4646f91e45a4a7355c8d6d4e81726f31d6d21ca2a4879dc0b9a44c54cf
font_02_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 17052 bytes
SHA-256: d2284a5cdbffc89bd4089be1c2e13e6df8792c51869ec085cbf2b6abff1d8ada