Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c171adbb17445ea…

MALICIOUS

PDF

88.5 KB Created: 2021-08-20 15:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b66e4a9f8114fe990c527f3c9dcf1a36 SHA-1: a627773341f0fcededa436b467605a1bc50c6618 SHA-256: 4c171adbb17445ea2637ca35d227f3839d8c7f9bde2984f29bdb909a10044573
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 or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other disposable hosting domains. The primary purpose appears to be directing users to malicious content or phishing pages, leveraging a technique often associated with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://garglob.ru/uplcv?utm_term=how+to+install+netgear+extender+wn3000rpv3 PDF link annotation
    • https://floresdeserrezuela.com/aym_image/files/79101977252.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/82952528459.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a17cc815e0---nipewawujogeladegal.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084dde1c7236---sefujomuxixowalojimufu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608498ba04baa---60810780743.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1d4c2a03---1283160478.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/vajezorogozugumorobomuk.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/38494365844.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/4144397060.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/hsgfnjcseh03rkvmbh029p83j3/zigetunozufuronutavezuzi.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/vinowidimenisofisikutik.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/96697515526.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/magozixukopaz.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/forobewaxoter.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/12758005238.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/6294755804.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/7dc544c8fb8f30a9cf7242e888a6a372/gades.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/59036390562.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5o8ecq86gvaiop8sogmdud1oag/tejalox.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/texixoxolep.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb3fe4411---38031044143.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a6fbdf002---53806776750.pdfIn PDF document text
    • http://kbinteriery.cz/userfiles/file/22399670784.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_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 17020 bytes
SHA-256: 98aaf5bee388bc2059ed66d754140866714f8d9c2f6566c8646c1cc4215c8473
font_01_sfnt_off000121b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D0 11108 bytes
SHA-256: c6231c3e117dd647c135c230b730dee515065013c28ac4ac4adefb8838785fb9

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