Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed3ac25827506fc4…

MALICIOUS

PDF

82.6 KB Created: 2021-09-05 21:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 72a9f9e927318ce5edbc9015f15e12ee SHA-1: 2ee53d12602aca5bf44118101346ac3cfd002b4b SHA-256: ed3ac25827506fc4d0fbbca837e513dd76b450e0f959eec03dda3f202c168b2b
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick the user into calling a phone number, consistent with callback phishing or tech-support scams. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports a malicious intent, likely to deliver a secondary payload or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://guides2alpes.fr/uploads/file/13310837649.pdf In PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/42cec24703937730c727b72bf09e711b/jazasojugiratejiwu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/11469016060.pdfIn PDF document text
    • http://geasit.it/userfiles/files/48393286261.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/7024541922.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/32456525261.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/edda7607504fd0edb4543b07ae9d397e/24032380830.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/9870d66ece6d796220de757845f86fe1/zolum.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51ec4329d---11136397711.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/60077658166.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8386a4b9ae---9897383872.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/851t1r7p7f0ng0hll0qauaqh5a/88797194354.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/hbuch7na8j2cd5gbivt5o3deg0/24087684258.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/93119468220.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/7f9a9bc66d1cd419940db4f30b54214f/zirakiverafefavetit.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/76235720046.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/jazujamujeresojin.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/37212941650.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/tobexitixijuwoveforobu.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210901/file/16304273137760.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/21be3511692d0abf627f5e02cdc76127/72209825604.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/memokaragolipulubitinu.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/wukanesadavivosu.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/mivubiti.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/17396798265.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/26547566541.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pusirage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=lcpdfr+how+to+install+sirenPDF 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_off0000dcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E4 17864 bytes
SHA-256: b6ed0cb266f6b54ff49c0d63c959592652246af1438a2e5f6e05fc113d7a9d7d
font_02_sfnt_off000123a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A0 10760 bytes
SHA-256: 18118be645b191e70308998208eb29b3354d7003fa1ea44e12439c590438fdf1

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