Malicious PDF — malware analysis report

Static analysis result for SHA-256 19c59ab0d9753751…

MALICIOUS

PDF

73.5 KB Created: 2021-09-04 03:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6279703b0a396b1a2764cdf83f5db979 SHA-1: 966032b5abe0e80ff47f5ee79c55f9aae27af53d SHA-256: 19c59ab0d975375137168ad8933670f052759caa109a609ac41694d4e5a55dd7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The presence of numerous external URIs and link farms suggests an attempt to redirect users to potentially malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed as a callback phishing or tech-support scam, prompting users to call a number for fraudulent purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=anne+of+green+gables+pdf+file PDF link annotation
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/ee77bad4d91c3c9a68ef46f43ee80960/27904190473.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/39293563148.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/37615329809.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb1ce46067---35627858977.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161189865b28c6---91565899548.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160d87c0c0320b---lajereg.pdfIn PDF document text
    • http://velocimapper.com/webfiles/file/25421099634.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/56806130918.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/82909406961.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd331e7e3---84564310177.pdfIn PDF document text
    • https://bem-sa.com/img/file/65786512108.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/juseweroxipoberimodin.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/98273439432.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/mogev.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/e5dg7nfib1qu3vo9kq33hbl77u/fasimepog.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/sirejurutuxesipopiguneta.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210708_AB786C5086DAA4AD.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608b77152ae1b---roguruwowebazikujiver.pdfIn PDF document text
    • http://citadelcaralarms.com/userfiles/file/wujax.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/rabalugor.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608df9e836c65---54307722310.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/614d5c63993001a1cfecc62df424e696/mejewazovejupidupomoxu.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/gojakimalugopiwo.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/zupokisoxukuwafino.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2ophg1m4nvpfn432r3vs4lec34/wozinowalotonutifo.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_off0000b845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB845 18296 bytes
SHA-256: 34b6e5f1f1003d54b8c02b443429e528e630955c83ac71df66f628eb041d2298
font_01_sfnt_off0000e7fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FC 10696 bytes
SHA-256: a542288daa45c7af9141c8578397795832142201abe272d2c91715ee15941b7a
font_02_sfnt_off00010037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10037 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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