Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1452e1a6e83433…

MALICIOUS

PDF

123.4 KB Created: 2021-08-07 14:35:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 88813f7fe92b5c018ff203f6e2608d07 SHA-1: 4ba6fbd0371076281b90526bcd9e0124ba2038c4 SHA-256: 6a1452e1a6e8343313b5148b474a5b8535f944a15ba414f9b9eff09d371606bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a callback phishing lure. It contains numerous embedded URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt designed to trick users into calling a fraudulent support number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://swalaya.in/userfiles/file/16869311101.pdf In PDF document text
    • https://infrastone.com/userfiles/files/zuwenogapo.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/62467878724.pdfIn PDF document text
    • http://gapp.fr/medias/files/vekedekavokusam.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/46800164756.pdfIn PDF document text
    • https://ocw.tw/uploads/files/42221272894.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/24539035590.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/74468268334.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/64070302798.pdfIn PDF document text
    • https://citytrafik.nu/images/file/xadaniribunepe.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/96850039513.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb82e15213---pogevavodepoxewinu.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/kudusare.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/34007459045.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb458e6fe8---90084821548.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160719a3873fce---fitazot.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/53770350419.pdfIn PDF document text
    • http://szrealty.net/uploadpic/2021-5/file/2021051003531673499.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981c4ba130---juwovutugeti.pdfIn PDF document text
    • http://fedoro.ru/upload/file/zubamivefugujukinaja.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/45507497209.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/nemiribigotarupe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=a+level+economics+topical+past+papers+with+answers+pdfPDF 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_off00017ebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17EBE 17772 bytes
SHA-256: 9990392aeccdc1626098071bed82d2f554458e39f465874272e2ad050cab81a2
font_01_sfnt_off0001ada5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ADA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5BC 11020 bytes
SHA-256: 82e099f2c5bdf486b0254925993c89982c36a8699d12a9fb0b3cd12f4e918b88

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