Malicious PDF — malware analysis report

Static analysis result for SHA-256 19ec35fe0673bd98…

MALICIOUS

PDF

83.7 KB Created: 2021-08-15 00:18:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 28a013ce3e8bffc01b6da9520a8a568b SHA-1: 6bed01a9fc17708ca83e6cf53b75ae397cb99789 SHA-256: 19ec35fe0673bd982537745d4e92d98941b30b23d82e567fbe7bdee6cdc71df7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may also be used in callback phishing or tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/894af361afa0aa8d31760db1af1a9874/vijiripoj.pdf In PDF document text
    • https://strategieb2b.com/userfiles/file/61620542389.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/52739002942.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210725_328200FFC53CA7E0.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/reguziniwazuvav.pdfIn PDF document text
    • https://contactfm.be/userfiles/files/kipaxodiparetutupajud.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/210f583fb2f70b63d24537ab3869fdcb/66690440684.pdfIn PDF document text
    • http://bronia.org/userfiles/file/dolejiwe.pdfIn PDF document text
    • http://araonline.hu/uploads/file/40740430301.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/356be339a7124102cbb1a157fcde5412/fefaruvazobeporiledukud.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/6891377717cf70fb11b71f20e1963ee6/8035581611.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/iopq1i336a6pse9qdg92drhhnm/ligaxutobepuvas.pdfIn PDF document text
    • https://harryfok.com/ckfinder/userfiles/files/jufipuwepuzexofadogoz.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__61068DC2C2F09.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/cd9877de8d2dcacce0926b3e037a70e3/3608186054.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/35886784749.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/35976384189.pdfIn PDF document text
    • http://www.ghidmariaj.ro/app/webroot/files/ckfinder/userfiles/files/80619055201.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/pimebasebivigubasi.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f8c80320be---magejonabononudutokukesuw.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/81095201390.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722a5a5e755---kiliz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+do+my+iphone+chargers+stop+workingPDF 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_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 17092 bytes
SHA-256: 9cc98f5d6ec0f28af28ac1a0639bc1fad25ce332360ffd5074a177ed07e336e5
font_02_sfnt_off0001276a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276A 11200 bytes
SHA-256: cc647f9ed4029ec4c837baf05edc17eedee7b195c83ffd66bbb0c6553a85a111

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