Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0a87772d4543b0f…

MALICIOUS

PDF

82.4 KB Created: 2021-09-10 11:56:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d15a377ce3a692cd3b78c7d7ec9fe783 SHA-1: 27e1ef9f2cd496dedb221d319685a0d47a04a18b SHA-256: f0a87772d4543b0f7715b589c14930e2bca3cf51b204e9b83a7959cec1dcc333
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://euro-ex.net/images/blog/file/guregopifafokemidab.pdf In PDF document text
    • https://artlabjo.com/userfiles/file/vevelatufemojotoka.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109030717061893.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/rogakesabatifal.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52128761860.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/gapodaripedebekipajevupa.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/jumor.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/83876327860.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae63d57e98---lewupuzodonojevi.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/87608827375.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/gipebedizonivap.pdfIn PDF document text
    • https://media-get.com/userfiles/files/nexagupuvogatakagakuzap.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/27147779947.pdfIn PDF document text
    • http://wenxuezj.com/images/File/72633434371.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/2752429958.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/wofugoxedozebagewojokaz.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/xilopepujujaxevafukevus.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/161383c8d558fc---16259014126.pdfIn PDF document text
    • http://yves-segers.be/userfiles/files/70471002981.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/xozinokonimiwatezakurex.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/10981395378.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/73907675954.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b1fn3ihhok4utnov4eeg8noli2/fazulaxarokevep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=8+ball+pool+free+rewardsPDF 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_off0000de2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2A 10536 bytes
SHA-256: c420c56750d44e5458bb5e58d07ffb3851ca321111b85f103a01e817ebd30114
font_01_sfnt_off0000f61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61E 17744 bytes
SHA-256: 3ea7ae7b551d95b3e98c9d3419e9bec27386547b01a746947b26a2a61bbbb844
font_02_sfnt_off00012412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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