Malicious PDF — malware analysis report

Static analysis result for SHA-256 b17b8f2f8093179a…

MALICIOUS

PDF

67.6 KB Created: 2021-10-01 01:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be57961dbcfe900fc658c13398c466ed SHA-1: 359540672088437c520ac56ec378795048abf2c9 SHA-256: b17b8f2f8093179ad65d016cda3ca3b4a26796da0a043a42023f6b1a2c63fd7d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, aligning with phishing or tech-support scam tactics. ClamAV detection and ML classification further support its malicious nature, likely as a phishing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=how+to+set+phone+ringtone PDF link annotation
    • http://koala-al.com/d/files/zasuvapa.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/27147779947.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/435eca84afc0829ed3196f4872487699/80224580192.pdfIn PDF document text
    • http://hainfelderteich.at/60862168291.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/xexosopinonizo.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/22734480084.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/sufedirebo.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/nevafubonodirabowis.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e2760c283c---nolasesakemaru.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/gagikefafin.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/50277014850.pdfIn PDF document text
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/wujivaretaxefaviwinatox.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/2d57d73dd909ed945837bdd94695a168/bumexarijezo.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/bidakozakad.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96873013268.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091418754_8009372.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/bifaxonizupaxipa.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109262304231506.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/45392411406.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wukejijojofitonadibidun.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/78287313495.pdfIn PDF document text
    • 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_off0000ad37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD37 10400 bytes
SHA-256: aa930061013d68f8d29abfd2dda6a559d92676540a99064a9a487df89275122b
font_01_sfnt_off0000c4b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B5 14624 bytes
SHA-256: f053272e84cc40416c33d818f85ed1bf364224138c3083389d8754051323a26d
font_02_sfnt_off0000e970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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