Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4dc040b5a4dc383…

MALICIOUS

PDF

89.8 KB Created: 2021-07-07 02:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c026f6babbe1a13cadf2153e91ec17b1 SHA-1: fbfc5ecbe191780087689ef9ba4ef2282465b301 SHA-256: a4dc040b5a4dc38324a826045b7170c1cee29a784d01d348fc3f763bebe46a9b
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm hosted on compromised CMS uploads. The document body is heavily obfuscated, but the presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates a common tactic to bypass gateway scanning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://aarogyamedico.com/userfiles/file/20219817767.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/73a6a326566622564662882641863691/xixubuvokebonazezudabe.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/doromalujoliwokibaneni.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d19964d3b---8061411692.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ca5771e8eeb---rasifu.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/cho4mpdp7t70caopitk5nvmmc8/rodawunizowafomenadujot.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609008dbc5689---669747803.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/jvlclaoio3iet47b0msalk77q1/59428957479.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/naputelewomug.pdfIn PDF document text
    • https://bselink.com/userfiles/file/fokexejasineturojam.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/xelemozezo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/30078136446.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087659f72b0f---rorosokaxixisetotabufumot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b68e5d8130---nowifitoxewatunobisaraluv.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c50346b03---42859004096.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/vimabobojokaxamewetexego.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/livomazuxetipede.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/15736547865.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/a7f64852d4859c6e3dac19840b890d08/tubamaromane.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2757abcbe---gaxudawuzawamugigixolu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/ghvj6cs1861p77lpfbdct8d3rj/zufalirudexujazivu.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b77eb290094---kizafugimagixejarofuf.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aac88da5b0---xirizamumuluzapobo.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ludun8knr76c65gbv4kc0prkv8/39650272296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=different+pdf+in+one+filePDF 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_off0000fe29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE29 16624 bytes
SHA-256: d501f20617078d1bfbdd55bf0ec473dc77e6025e5ac078b8360e93b05d630d23
font_01_sfnt_off0001297a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1297A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14191 10160 bytes
SHA-256: 0de413f317f5ed944f19d0f6bd01e79bc0756e06249df2de0cdc93b0c2a21c79

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