Malicious PDF — malware analysis report

Static analysis result for SHA-256 d47d70d257b90211…

MALICIOUS

PDF

77.5 KB Created: 2021-09-18 11:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 983afa6975188d9634333478d7b828da SHA-1: fbf54606443fd1f0a3d50e186e5bceb616308b78 SHA-256: d47d70d257b90211bcd9164def65b94d95e081d47eb603f9306a0624f1d76605
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised WordPress sites. The presence of 'utm_term_redirector=True' and the nature of the URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393a33ce6cc---lexuxebeduwotababobu.pdf In PDF document text
    • http://bbhshipyard.com/userfiles/file/jogiloluluweg.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/logofasij.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/97993351215.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/5118549524.pdfIn PDF document text
    • https://coevent.ru/upload/files/nanenukigapitageme.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c64032d6f0---78014026701.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/12298160535.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/tegemosolopu.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/sikivejikosanalirubiliba.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/86718850591.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/romotofibu.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631885766.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/gisojalanizadofup.pdfIn PDF document text
    • http://top-caster.com/userfiles/file/77955149640.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/14217783991.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/waruxoxobutipukowo.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/13994846104.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/529bf5f33a0b017430eb7fa1bd989df7/dageninulupifuvise.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/60294186249.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/safilopuvafuneno.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/vuzorujufaperibagazawil.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/54301513145.pdfIn PDF document text
    • https://rcot.org/userfiles/file/18623578674.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/87013328079.pdfIn PDF document text
    • http://erpos.sk/data/files/kiwusavomoseganegonu.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109061320341071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=jt+sniper+game+downloadPDF 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_off0000c404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC404 18976 bytes
SHA-256: 577a34da479a45c4fa9658d52725102f470b5c7f31a3622fdbd7d2d5538cbd35
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 10812 bytes
SHA-256: 2ee131ae3b35624200eac6b7942be96772be5387f7fa3f2f44910d1a22de20b2
font_02_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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