Malicious PDF — malware analysis report

Static analysis result for SHA-256 845e0982ab509ad1…

MALICIOUS

PDF

88.6 KB Created: 2021-07-20 19:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c6774733e16fdf8048dd91d73c3579ce SHA-1: 060673180a78834fdc6ee6acd45424fab39c798b SHA-256: 845e0982ab509ad107b51cd4500fbadf81e2091d005d25503c8f5089831aa1e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://langeline.com/ckeditor/upload/files/lemuwixopotepe.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03ec32b524---fiposevefojekazix.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/82741462584.pdfIn PDF document text
    • https://iva-vietnam.com/userfiles/file/vadokaretumimoten.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/vilajuxefe.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/5061917954.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/1150921579.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/33549c6e6c726827faf943ee6f99c806/23599403429.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4234b311af---46485890406.pdfIn PDF document text
    • https://kompaspt1.com/contents//files/10001977159.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c379835283e---86730752445.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c510e294d---9596224165.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/veverot.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3ffecbb1cd---11465648466.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bb4c0b8620cc17b7c3435b646474c518/28369096260.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f89173d3a---63026546135.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e6713e0e066f97508d4dc8699c398eb0/zunololubenole.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aeb3a0061a---51625609489.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c886f7ef73---sajagekajajinaj.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/felixege.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/jmaim27c42vpc2g71u14qiu90s/wijitefo.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/giral.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/540a3e6c82645e77cafc071552be5c34/50333974112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=english+speaking+questions+for+intermediatePDF 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_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 11264 bytes
SHA-256: b90f9a47d0c43b650e1851cfae894be63db60b4061b9612061353e314e8f2efd
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 16556 bytes
SHA-256: 0d1f63a27ded4b7d81f97b5195ef8e54d570539c88e4b439c92045e42b9fa9b7
font_02_sfnt_off00013ca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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