Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa33c79b39c4bebb…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 11:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70db0c06537b54f20b0442f8266536f8 SHA-1: 783029d5f3d9a9d05c0a30738cf1e1aa444f77d7 SHA-256: aa33c79b39c4bebb0b876bb02c717b43b6c1a897bbffb967630a01e4b6f86f83
116 Risk Score

Malware Insights

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

The PDF document was flagged by an ML classifier as malicious and contains multiple links to potentially compromised WordPress sites, indicating a link farm for distributing malicious content. The heuristic 'SE_CALLBACK_LURE' suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech support scams. No scripts were extracted, but the presence of numerous embedded URLs and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • 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 http://bratislava.topenglish.sk/app/webroot/gallery/files/34582630830.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a607ab6c8f5d924012c919ce7fcaa7e9/74983029803.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b9fa91aa41aa17ee78b33713c286a8c1/lutebukagagipakewifobovat.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/wexopiladu.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/nogesewamabarazo.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/berajesefusekepobiliga.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc9cdb65bb---67946362972.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/gifinutovagidexeputa.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sejavo.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/61653400395.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/lojizape.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613af89e446b1---wolejebu.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/89533022148.pdfIn PDF document text
    • http://gevenschoenen.nl/ckfinder/userfiles/files/5227875573.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/renulapekijeto.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/85386995954.pdfIn PDF document text
    • https://petikdaun.com/contents/files/zixasasemijumuxubav.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/84845101336.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/50284378646.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/seboxixijo.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/savajekajesugegesivageda.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/juzagub.pdfIn PDF document text
    • https://sitarasign.ir/data/file/boluvod.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/22660195999.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/xapafefogenogibaz.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/wixokewesilojelurepagaxom.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/8795331764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=iron+blade+medieval+legends+rpg+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_off0000d2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E5 10880 bytes
SHA-256: 82a87c3dde56f5521b382de7e8edd296cd8446e629d2adf8d21fe1c7b2f410e1
font_01_sfnt_off0000eb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB96 17736 bytes
SHA-256: 0819cf3e421935a579e6a21a4f87650ecbc62990a4d4c8e92b0eb4a6450d8b9d
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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