Malicious PDF — malware analysis report

Static analysis result for SHA-256 54799d74b9a27fb0…

MALICIOUS

PDF

89.2 KB Created: 2021-09-16 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c8519ee2bdb83dd082e8a5ceba384d27 SHA-1: dd479dcf172ddb4f4ab6012523f21cd476806050 SHA-256: 54799d74b9a27fb099a237e471a50496c9b74b4d08e10afba81756f07a66b2dc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or compromised content management systems. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing attempt, where users are prompted to call a number. While no scripts were explicitly extracted, the presence of multiple external links and the ML classification indicate malicious intent, likely to direct users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://chcial.ru/uplcv?utm_term=note+9+pro+update PDF link annotation
    • http://kcntanduc.vn/img_duhoc/files/babatagiwosakewa.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/dovodis.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/58889055884.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/mowulaw.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/xoxulagobetojat.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/sakuzunigalik.pdfIn PDF document text
    • http://cityfate.com/files/files/71886125690.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/pupamuzotuxosabipaguseme.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16139c1d5b2b80---nowupewe.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/73751646143.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-11/20210911182658405620.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/73251537754.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/64086719223.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/82075828263.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3d28b414e---29057594389.pdfIn PDF document text
    • https://www.khaosanpools.org/ckfinder/userfiles/files/takomuwa.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/wosawe.pdfIn PDF document text
    • http://asqcert.net/files/files/pugixiwixilatovagigo.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7efb41824---40326841180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345fb1a5118---81388537252.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/nawex.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/fuwunozuwazo.pdfIn PDF document text
    • https://vendax.ro/files/file/23988868123.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b85ec339b4---natemadalakoxefutar.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/73201593260.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/53870492973.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D3 22428 bytes
SHA-256: db2bf9a30c2fb0c0b62e6e7c8f86e560178246a4f504771e48bf85f5b56c82ba
font_01_sfnt_off00011f73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F73 10220 bytes
SHA-256: d654aad535645e0b8d1d88fefe90c7b0a2a1e33a8bdd617ac8382f0d3234748f
font_02_sfnt_off00013689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13689 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E96 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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