Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe8405fe764f3934…

MALICIOUS

PDF

86.6 KB Created: 2021-07-16 10:22:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 752de298c20f0d46d8c67287523af263 SHA-1: bc4b12e7ea772faddcc779b3f2e8ec6a9b2fd04f SHA-256: fe8405fe764f3934ecc148fef70eef8f0b0a10b74c313f7a257997ead7780585
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://allytemp.ru/uplcv?utm_term=candyland+adventure+computer+game+online+free PDF link annotation
    • https://gloriamus.org/Uploads/userfiles/files/meviwegij.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/rapugadukavofebojopumabi.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b564679e38b---virabarobudekotujoretil.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/95035665510.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/48172387825.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/5a34m3135u7t13egjg5horou5r/bowuw.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b154158c---33128441003.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ed3d48cd259ed40e596b7192b8a21d4d/kilipodu.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/7421048673.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/gubegikagukud.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/5745710121.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/36922379397.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/70jclb4sc1f844l4cuh8dvbbd2/kejakezumiz.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/68564002542.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/718e5ef5f538e44f1a79ff736ada6272/xijixifulitimemezomaja.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d490cd5482---zizupefigafedize.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087a1aaa00f9---xajutirapu.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/67b15d76249f152bab9dadb166f65d22/60746440221.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/fewizetebarijetajupid.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/32767684590.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/nojafezuriwogatup.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a71a9cfa72ba0c51172028e0a0064cc3/32397137321.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f87c92670c---kuwetalivoketoxixere.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_off0000ec36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001044d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 11108 bytes
SHA-256: a83d9d1ca96d17137a175780ff76337e0254cae48e2ea7f8862624cca67caa44
font_02_sfnt_off00011e06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E06 18016 bytes
SHA-256: 4b7fae5691f1326fa5eba6d8d9c0946b387cafdf48d873369dba4541fb7bdc63

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