Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c2f7f90f243036…

MALICIOUS

PDF

81.1 KB Created: 2021-09-04 16:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 5ecc6d9a42e3f42b3c322e022f596ec3 SHA-1: a511d5fefaabb2d756b2982760a0c0c798a486d3 SHA-256: 95c2f7f90f243036b54db8d464894a013e98bed5d72913bbf2a6f4359b8fd5fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is unreadable binary data, indicating it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/kk0siph5jkvl0pfpbg9961vo50/22925920949.pdf In PDF document text
    • http://banghaija.com/userfiles/file/gapulanawigesaliker.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/megevaxuladuwaxoxalaf.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/wimesodasebimitozagak.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce8221c111---bojisasederuni.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d7b2345bc---69109615387.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/25921404198.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nl6e72m0unkvcobu04m9u12ihv/17066758425.pdfIn PDF document text
    • https://mimpishio2bet.net/contents//files/51435272532.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f6a0ef422---xigeka.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2c6450bd5858781176054e2dee49aee3/jipodixumitonevukafone.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/700c254543ebc9305ec8d7a88419d24f/wexoluriju.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/23b3dd727fc68fb88a9b3626e9e24ef4/ramilezoximezi.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/lobanukopenajojonoloxex.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/9642203945.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/6e1124d968216d3b1d147b8522ef1b8e/divawirewivefefok.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0a7c5bf4a---zofepex.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/mikukivuzawasotuledisaw.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/muninos.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/bolodof.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/c80f509d411b39b89565729a7f1816d3/62854587525.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/senemitedepitiserejovo.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/53cf3edc74ddd2bcf966bcde255169be/77661988312.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/9bb7f20759a444bac3c477969b237c61/34392180471.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/tozidofizabawev.pdfIn PDF document text
    • http://mikailang.com/userfiles/file/20210801113804_1395082206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=opinion+publica+y+democracia+bercholc+pdfPDF 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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 10996 bytes
SHA-256: e384568794fbaab98d964829bd171d0530474bfb3de422b02097e7ecb5c9c928
font_01_sfnt_off0000f0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D7 18644 bytes
SHA-256: e19997aed96a4e84cfde5c974c9de6997881f8495cb8fdb4661a3be111295d85
font_02_sfnt_off00011fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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