Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f6cb16853449327…

MALICIOUS

PDF

98.8 KB Created: 2021-07-23 08:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f9d0b6a78caf1b7afa651d8aed4221c9 SHA-1: 0a02d41272e3e38af3e88230903c7b4fc7346957 SHA-256: 2f6cb16853449327469fe395425dde60de4c8367af09b14063aee54748404667
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to potentially compromised websites, suggesting it acts as a lure or dropper. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing attempt, where the document likely prompts the user to call a number for a fraudulent reason.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://a-swiss.com/upload/userfiles/file/11699559938.pdf In PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afdb3eb3a9b---zesotofodizojagofozijuf.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6827059f3bb6c186de9eeb5c9a1802ee/fakulokakabapevoke.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/84580377789.pdfIn PDF document text
    • http://harrisonsfamilyreunion.com/clients/62911/File/dixex.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/db5fe293db34b8a37355e1e55672bd07/17564333950.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/89883803913.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63a7124d13---89197737422.pdfIn PDF document text
    • https://dpmceramiche.it/file/47712112500.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1k1139eka0k1dqr97n031nf580/77861553150.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/f2daed8bd4c6e7740aad00079dcf97f5/fenujud.pdfIn PDF document text
    • https://topplene.com/upload/ckfinder_temp/files/20210619190757.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/c37b7d7542f1e5ae3215b6f0513dde07/meduwemugomi.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/12741071307.pdfIn PDF document text
    • http://gsoutreach.net/clients/e/ea/ea4f28bd0b090870cbed8536b6d1d406/File/xuxokewowasiwawediwozafed.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d604c712d8---98781573680.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nowetikesusezumitabifu.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/be23e7d43366e57320dd0d500f32e39d/tekotuvavulujexepuwupez.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/papimolenukamof.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd1ab40bcc---kitosuk.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/16577933698.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071d0a93a432---kezomufuboniruku.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/856f4b28ce69d9d1cce0799036db4601/rabutadexitevodax.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/99271073420.pdfIn PDF document text
    • http://wjcopy.com/upload/files/93934173692.pdfIn PDF document text
    • http://goksirlambinowice.pl/img/upload/files/netemigugukisepamuxezig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=catastrophic+events+worksheetsPDF 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_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 10700 bytes
SHA-256: c72b328ee98f6f472024ea7d3e5e3109ff87170764dca2bf57dc8ab89879ea5a
font_01_sfnt_off000133c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014bd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 18308 bytes
SHA-256: 1a5fbb92a53def011ff3a33dfa5aa2b3f4acb29776808727889f83ff9860135c

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