Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a25a2d304f2c37c…

MALICIOUS

PDF

85.9 KB Created: 2021-08-01 08:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0535fe535e38ba270f2416bf9792edea SHA-1: e40881b57902ebf2f3500e9c8f1fd2102b76810b SHA-256: 7a25a2d304f2c37c6e0a2c677c9b6a877bd3759bd1e12665f58b0a77771d4bdc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, presenting numerous URLs that lead to compromised websites and potentially malicious downloads, such as the one found at 'https://synerhu.ru/uplcv?utm_term=download+five+nights+at+candy%27s+remastered+apk'. The presence of external URI heuristics and link farm detection suggests an attempt to lure users to external resources for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=download+five+nights+at+candy%27s+remastered+apk PDF link annotation
    • http://lukoilmarine.com/ckfinder/userfiles/files/83055827272.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c92d359146a---xadikekuzobosepuwaguduru.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/bavisogoparokolulegore.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/132ae4f388f42be23adb921d807ec3ec/47083055437.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093bbbfc807c---52599877133.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/meneradosawejubinu.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/83217957898.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/vanukogigit.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/23384709885.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210624_0FE9575BF22C0B71.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/dilivota.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/pigijisafovamegulinugaji.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/86435515071.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/31720336187.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/98765071729.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/90319924475.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/58243121733.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/dukifedero.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4a2ed8f4ea6c67b134164501050fa674/65819482141.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/fa7c209ad007662600c146c6a13ca9bd/numerizosejoweluw.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5f37c87b0---retejojarebaroxixegofab.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/62074219823.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/d6510b1117e560f8cb6799be1049aa76/39505355948.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6648754bfe---45943887107.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/40371068529.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_off0000d3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EF 11460 bytes
SHA-256: 22b77e32379e9669548c2e13a0914253ecafb7de46007502ff7ba5217e95c9f5
font_01_sfnt_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b
font_03_sfnt_off00011c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 16692 bytes
SHA-256: 71513ab8d3bad56b21385d91b13db0daab551f4dcb3000fab53b258a35ebf510

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