Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ad2429478d8eb9…

MALICIOUS

PDF

85.1 KB Created: 2021-08-28 17:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5b2b927367d6c59793fed17bebe6be6 SHA-1: 0d68caba31979fc6a9da93859a561f5b744c0ebe SHA-256: b9ad2429478d8eb944541be6cc8da2931b3d4bca52d4dfca8f800afcead230e3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which appear to be part of link farms or hosted on disposable domains, suggesting a phishing or scam attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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=the+spay+neuter+project PDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/78920593398.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/lukanopumiraj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-17/20210517004756878975.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/61593871908.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/nubodaliwajarasemolurugu.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/82733158970.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/nolupu.pdfIn PDF document text
    • https://webaprint.be/img/file/54617902338.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/h94vduhaabc848nkcpsgab2m59/37358570938.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082487633f8b---45047260620.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/33262660090.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/36174703830.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/napisokanafunilopotowejeg.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/fixenerilumupezedemuzo.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/pokemotedawuxuwu.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/gv1inphltrmf1jg7gq1tfkj3o2/kasemomirurugarubasib.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/sapaxuforiva.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/40056125964.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071872362554---xesinujepide.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a042ebef5fe---91983506834.pdfIn PDF document text
    • http://dakmet.pl/upload/kerumaseb.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609761c4d1228---novuvunisamugonufelo.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/30bf97827d5c4fe87ca46391d82892e6/36514412846.pdfIn PDF document text
    • http://fairview58.org/clients/b/b5/b5cf5456a34e3fefef15e35162a7177a/File/62389113721.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_off0000e26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26C 19392 bytes
SHA-256: ee26bb30ddf9ef825528e0ca1bacd0c3249ff634fe906f70e0010bd5a2c68e6e
font_01_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 10640 bytes
SHA-256: 368b366f2b7b02246d6696e056a964e0d16ca09b81877ef473a68bb027ca89f3
font_02_sfnt_off00012df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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