Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff31942070c79243…

MALICIOUS

PDF

79.0 KB Created: 2021-09-07 09:09:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c5eb3625f5be0b28a03bbeabdd5342fb SHA-1: 6f08739858095bf1e976c981291cfc8bb3fa6611 SHA-256: ff31942070c79243e1b5eb48fe749930e14b13bee3f4d4081e5a30c2a85cc23e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to host malicious content or conduct phishing. The 'SE_CALLBACK_LURE' heuristic further indicates a potential callback phishing or tech-support scam pattern, although no specific phone number was extracted. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=ism+report+on+business+pdf PDF link annotation
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c72522dd0f---lovoruwubegimu.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/2120424517.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/sadisazimepow.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0de6136d---gumeg.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/42786485333.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/86085999153.pdfIn PDF document text
    • http://teraval.cz/res/file/zasin.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://dailyiat.com/html_upload/file/87191460041.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/95076817365.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/2743364221.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160862013b6143---bojopepemijed.pdfIn PDF document text
    • https://kermanrooz.com/img/files/nolesupunozagazib.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/318311d46623000da5a1039e77cc545f/kifavo.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/natixaripiposurodabem.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/28183909521.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/51658976531.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/no5arh05uht5qspg7b8mu6ved5/kilebisi.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/lopagajepovuzasazavunak.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/nawuwodulozigefivig.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/tebogaxamanivelorurabidu.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bcqhlnjeukb011i7sli46opvab/gomijivogamakokavow.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_off0000d304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD304 16820 bytes
SHA-256: 788e8087d65819ebb115be2225824a4324928456da7cac7e4d09ded4a9094e95
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001167c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167C 10644 bytes
SHA-256: c5a5c14e0df6b4db126612a8c3ec474ccb72d342f3108a652e5aaea03a782860

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