Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba5cae4f4428a0…

MALICIOUS

PDF

95.1 KB Created: 2021-07-06 06:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e23bf121f8e15dbb64092cf5249a9a25 SHA-1: 245f44bbd1186e17fa573a6078805edcf171d1af SHA-256: 62ba5cae4f4428a0bdc9945e15a1a7db345fa932caa0343a20541d9a4dd3223a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised or disposable hosting sites. The embedded URLs suggest a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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 https://irlanc.ru/uplcv?utm_term=mathematical+applications+in+agriculture+pdf PDF link annotation
    • http://brandiassociati.it/userfiles/file/doruwobowexo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160beea8b2715a---70286979627.pdfIn PDF document text
    • https://ive-cal.it/file/matele.pdfIn PDF document text
    • https://shibbirs.com/media/files/99257061552.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089df0b220e7---doronulop.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c71f7832cfa---dixekopupoxebaweroxi.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zomowuloredumur.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/84018809247.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///jikav.pdfIn PDF document text
    • http://envigest.cz/upload/file/topabuzunaboli.pdfIn PDF document text
    • https://aneri12.eu/res/file/pixuxugeduxeginelajizip.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/7i53s2a8p44l0rmk2b8e7vc9g0/zogaxuxusakinanugalalagor.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768fb06a581---87142707931.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9169bddc82aee48365202c5eeba4a8ac/memev.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bafa27277---levej.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/84632436503.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/23115044116.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d19501b9ac---43190299919.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/8869493083b788dc275fe67aeef797ae/vuwuzifetadelovikoxadanes.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f037386ab9d22b584867c1e67da37a44/sisonuk.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/60f49fbbda89ac5818bc8dd43868bfab/sutijuxitevixisarus.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/38034747020.pdfIn PDF document text
    • http://aweibel.com/Photo/file/morenegibopimelekisube.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/nulcmeeqs52kuk9p3tff596eid/gonudib.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF494 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAB 11160 bytes
SHA-256: baa3185f30d4a8eef199c5f3bc1beaff4c8181e65b8d2713dba48b46b768f138
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 17100 bytes
SHA-256: 9986b585037627f503fc3febe3b7c2be111ffd07f920d99ff2239defa5a52629
font_03_sfnt_off000152da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152DA 17852 bytes
SHA-256: 9ca5c795d5ca77640d5b9579f86a4e621458908cc36c63f1ec8de73c72797894

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