Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4bcddec82f6aba4…

MALICIOUS

PDF

115.6 KB Created: 2021-07-16 04:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 657b107a6b32e584f62c9461635a00ba SHA-1: e42c95c083dd61a885b50a001434b602857427bc SHA-256: a4bcddec82f6aba4ffa9365c1178b737e4986bdf3a60572266dbe774215335c0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of many external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9752

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://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8d2f2966be6c7497800c12073c2a0a1f/movagakazo.pdf In PDF document text
    • http://goodtraefarm.com/ckupload/files/gamefutukidisamesuxuxe.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ce21c941b---36161247523.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/15678291138.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160822eb3bfe49---zutobo.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8c126dae3726d05c42d1564b700de7f9/38581341985.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/joduge.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/nototamixetuwe.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/23427104308.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/bdd3038947f934b71fcd5832fb12cd1b/36183901686.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ce237d25e---34239827246.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/81018741483.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/83038622953.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1682a92d5---45039451026.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/temutozidape.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/puxogatisadulezuzes.pdfIn PDF document text
    • http://changdahk.com/upload/tadejupumev.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ac34802b8d9---64813083693.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/labexikebuguf.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160923ef5076db---95147070098.pdfIn PDF document text
    • http://pratiklinik.com/img/userfiles/files/wazuwixibixadobeba.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cbae7405655---33826508624.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d68f1c8a---bepowas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=fortnite+smiley+face+textPDF 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 2672 bytes
SHA-256: 40f67f0f39c1e86672d2a8d40d36e7027454fb0e3283e83068fedab0a0900259
font_01_sfnt_off000104f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D08 23532 bytes
SHA-256: b00c5c82f513a2ebf07f863238c2b9d6129b121027dbeb317727a8345d94389b
font_03_sfnt_off000158a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A8 9628 bytes
SHA-256: 05dca120da0d0b89416de88d672aa7620a96dd0ce3d59eb1f2ef0aa5fb541c97
font_04_sfnt_off00016d47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D47 38504 bytes
SHA-256: 5d2e7ab34212dace6163fa73595bb64c07b1202ac454b6bf34e3e8e9b950e43b
font_05_sfnt_off0001a58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A58B 10688 bytes
SHA-256: 41385fdeb7cce622e502f602e996bc34c40aaad8759b6a1691784e8df4768862

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