Malicious PDF — malware analysis report

Static analysis result for SHA-256 45ff14a8281df381…

MALICIOUS

PDF

89.5 KB Created: 2021-07-10 03:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 10d7454fb189a3d5dbb9121bc2922f8b SHA-1: 3b676e81f2022b5dadb8de37fe3e14c306817c28 SHA-256: 45ff14a8281df381b7344ee7868371895304a6ecf5136c3f3a06057b8bdd5679
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing and potential trojan distribution attempt. The document contains a link farm pointing to compromised WordPress upload directories and disposable hosting, likely serving as a lure for users to download malware, possibly disguised as software like 'minecraft pe apk'. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://inwebjor.ru/uplcv?utm_term=minecraft+pe+apk+download+android PDF link annotation
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/064dc5b35dac2071925d117e341566aa/juvazorefupeto.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/f7v277dseuaph0i4fl64ip2882/xurozejab.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/53770cb4972d2abf6b7ec353d2f03b07/tugagizibesixoza.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/275l9ieqe81c4a65omeua5nfd2/60965088163.pdfIn PDF document text
    • http://designpavelzapletal.cz/files/file/66232839032.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/d69gejm35lom8vpf1qgldsvns8/jixepesoxabuvonoresena.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/69403294111.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/rikakivoxojadepikuperux.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/lodizofolixurexe.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/67cd4d255e34d79e248e86caa40437f4/jomunasutapavedaguf.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ga8kdpccvp3gbe4c6k760amcu2/62839819674.pdfIn PDF document text
    • http://beijinghuojia.cn/userfiles/file/rofofovapibejinedi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a0ea68c6---sodimosekuzikeruwaleta.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/paxasavod.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608157945bcd2---suwiririgunurivow.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825fd0a156e---26107989546.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087584487c1e---gerevasa.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/lasadasusaxug.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/pezifotinopi.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/sesog.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/nazikofudojerezipinipil.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac486457fe8---didodedisolopuzukix.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4045f3672---disilasotivogabifamirip.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f2db7e3ab---mezawapadixejekapo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5C 10616 bytes
SHA-256: 9bf09cbd092be3ea5fcda68da2b9fed200d86e89d04d920149d47e6d1fb1cca6
font_01_sfnt_off000112cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CC 18336 bytes
SHA-256: 41b506b4c82a435a817077580401bae1205700e24d0484cfdcc81eaf28a099a3
font_02_sfnt_off000140b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1