Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ad250f2c1960013…

MALICIOUS

PDF

140.6 KB Created: 2021-08-09 21:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7692290ace1d089f0757c840f4e45cde SHA-1: 301b7701a9e2f8d2b7e4b6d9b7b30d619fcc47c4 SHA-256: 7ad250f2c19600134e8a77aba387a5411f90ed1b00df51da5475f64a97476404
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, and the document body was unreadable, limiting the analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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 http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/63913769265.pdf In PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/bepisoz.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/tumimalunugojibogegemib.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f32366396c---65319042595.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e75fb9989---37511605339.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/rivoleramedefeximixub.pdfIn PDF document text
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba7a594fb1---46628709718.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210517073246.pdfIn PDF document text
    • http://alkanboya.com/files/file///bipuzezupulatat.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/f99b5b2ed2678bbbc1986b6150cfc025/gativetewatilunuzug.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/i17mjgi6194mir3c2lgp455saf/62900276790.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/o724ibcalhlnrl71bh2puu6eg7/97085386692.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/setotifikus.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/277ecc30e9fadf3fe200712ee1ca47ad/43286103629.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f0941b2d5c0---tujijemenivogo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093ff6969c29---98361859413.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/tukuribifufakuvon.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/gdlqp096b6j3flffk4s6qg7317/ladetaramezatuwi.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/pewilafotojetuzesesopixi.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/35885455238.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160831d0595ea4---98569098103.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/667f1c7c39ecc18626892356907abde5/zozitudawigumixodan.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610da5231b46f---megasalozokujepidap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=mecanica+vectorial+para+ingenieros+estatica+10+edicion+pdf+beerPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A90D 11168 bytes
SHA-256: fbe9b4614b265df243e0a3c2661dffcb046e48012e069badddec93ba994cb6e5
font_01_sfnt_off0001c2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DAFD 18668 bytes
SHA-256: 8df6b0bd2f6958bc38ae42cb3d0ce5d7ed65f65a237225aed1175bc6d6a92507
font_03_sfnt_off00020c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C25 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c

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