Malicious PDF — malware analysis report

Static analysis result for SHA-256 1512598320130af9…

MALICIOUS

PDF

84.0 KB Created: 2021-09-20 16:02:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e423021769f0a9a89071a535dc80fbd4 SHA-1: 23de6b1e4ad8cacd5ffe21be97feaa6b853c84e5 SHA-256: 1512598320130af997b6d4289d25145db6f9ed60d86b6a7479eb8d84973c9071
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, many hosted on compromised WordPress sites, suggesting a link farm used to distribute malicious content. The URL containing 'facebook login mobile android app free download' strongly implies a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b524be3c---93104949152.pdf In PDF document text
    • http://seteo-dechets.com/images/file/ravopasununene.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/dopejevixugiwefexurufixu.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/13104622557.pdfIn PDF document text
    • http://proart.by/media/file/refivuranedij.pdfIn PDF document text
    • https://panoramabyty.cz/content/35477404632.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07b732edf---vovavesivagunexoxidasege.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/47941107048.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090618172219.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/nosilokodolabokuwiv.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/dunakenojufikivukubodofe.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/piroxuvedotepix.pdfIn PDF document text
    • http://konberdbio.com/upload/files/51959396153.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/39177722372.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/titib.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/dovopinalisu.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/wudupugavigijuw.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/pogeneronug.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/28448399674.pdfIn PDF document text
    • http://konyanincigkoftecisi.com/userfiles/file/xidozoxepanevep.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/nezuzewixuzejasurule.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135371d022f5---lofepixewipozukenenolur.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/90373606067.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/jebamipikipewimeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=facebook+login+mobile+android+app+free+download+full+versionPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 11328 bytes
SHA-256: c9aadadff727634b841d6ba62e3b254efdfdc3f189b88ae14d394d51641be54c
font_01_sfnt_off0000fb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB29 18132 bytes
SHA-256: bd7ad8a14fe19abdcbe36c3b583cb6817cf60e9437186cee80ecc1d991b03adc
font_02_sfnt_off00012a1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1