Malicious PDF — malware analysis report

Static analysis result for SHA-256 4817b705898cca05…

MALICIOUS

PDF

77.2 KB Created: 2021-08-15 21:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2e8bb02d7dffe8aaedce3c910bf28790 SHA-1: bff308d61bae33cb36dfc5da9132fb5c286bdd76 SHA-256: 4817b705898cca05ba169dd89c8d7cba3d24145f5b083bfd7b83d9ab2550c7f5
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and presents itself as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malicious content or engage in phishing. The 'SE_CALLBACK_LURE' heuristic further suggests a callback phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://egyiksem.hu/uploads/file/38882612940.pdf In PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/voximobuwegorivajewegime.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb146dca2b1---toruzefesedopima.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/44419680284.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/lanigokolon.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/53584058717.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dc773267c13---xuwamikofenazuzogufokaz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610fc49e34fde---rulobeviropaf.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gefovisevopak.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/10869148092.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/72476548199.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/fagotonase.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e9bd27ea990a5c75bfc8f56b45371c0a/95664480718.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/gazavaba.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/bagixig.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/51507745903.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/49308167259.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/85748499698.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c6d81d8052b2bad2af984d15d1f997dd/70678403947.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/jogikarofulifotixusos.pdfIn PDF document text
    • https://ranagro.com/files/50725252909.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/genag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=lainitas+m%C3%A9xico+ejercicios+complementarios+4to+grado+contestadoPDF 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_off0000c83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC83E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 11276 bytes
SHA-256: a8de48954e8f68edff04feab648954576f8010d18547da5e125f4b084ef069cd
font_02_sfnt_off0000fa49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA49 16612 bytes
SHA-256: c4d61cacacc7d4c6ba0c5f7224ceeacd0db95daecb525b682916bcd380906d49

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