Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbf2af51658476b…

MALICIOUS

PDF

69.7 KB Created: 2021-10-03 20:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 26c1466abbec5727064a2161b5f55a2c SHA-1: 18838c6b7bf3c9994dde43e71cc921db2154dd2a SHA-256: ccbf2af51658476b2949cc6b3101275dd6caa4a2f62b062a11cadb956a8286ac
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, a common tactic in callback phishing and tech support scams. No scripts were extracted, but the presence of numerous external links suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://philabc.ru/uplcv?utm_term=weight+is+equal+to+volume+and+density PDF link annotation
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/69513200755.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313ef583c75---36772150586.pdfIn PDF document text
    • http://mamnonkitty.com/webroot/img/posts/files/ronezipozonuline.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/1d00b09f2a0a54ba043de086b5357a83/jijer.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150b6ab41039---9459852282.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489798e1263---gudofinoba.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/widemitex.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144f199b2e66---kedexiwifovoriwe.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/xufitojakiwupudovibaka.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/30555995706.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/40164459586.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/48186484799.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/4243949795.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xiwetaluvipubigade.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/zewotiniwutos.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/sudalaxipazo.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/rabomofolejupusepiba.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/77196814512.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/fukirunamuze.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/53800691036.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/10297247958.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/tusumalonoze.pdfIn PDF document text
    • https://emenu.hu/editor_up/15388569861.pdfIn PDF document text
    • http://quranday.org/userfiles/file/timaxomuta.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/sezujixowa.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/mavuludiwegitu.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_off0000b254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB254 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6B 11012 bytes
SHA-256: 609c50ded56fe4a8df221721df1b4486ad487677a9197c62ec5929288dbf5e40
font_02_sfnt_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 15080 bytes
SHA-256: 4753aae1213ee105657d93a4ff09d08449f4c4d307336db52511497f57c41582

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