Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9ccb0336f22e52…

MALICIOUS

PDF

156.2 KB Created: 2021-07-01 16:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1e0efc781ae00b9d8b5e456b493d0540 SHA-1: 1a8c9a5486b07f6a5d8e7c1120542a49e2e6b561 SHA-256: aa9ccb0336f22e52989ea3017756b7bf3282e0e574e2292683d7d8a4a2c601db
176 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'SE_CALLBACK_LURE' suggests a social engineering pretext, such as a fake billing or security alert, to prompt user interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9838

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://orvosvalaszto.hu/uploads/files/84724331609.pdf In PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4f5c1136---74166955271.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/lulesumivux.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/1973074102.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbbf992695---fozozefibutudivefaruxuz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/vo0p6sc6puot67hihb961ln6r7/wemiti.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/58014309267.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087e2453f405---50528031972.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2d5e760dcdc8eb7d9178c1d8421c1e6d/ferida.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/belijonozaxajexe.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2d6f43f221dcc37b7b2d1bf01c0a9140/38011296944.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/misajuterid.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a5537daaa71ddd71668c26d654cecd80/xuvoseweregumofabebepewu.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7a6e2386d656d4e6079ae42d818015bc/xadedutagiputirimoxu.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/etjko9lus23lj9v0rjtocdrdis/53397386498.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/10143901383.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/df035743f8f8a4afbfc556f9d4a7a71b/jarugofajik.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/f8efb66f9f3de87915b95c78a4a54437/46012687646.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kijel.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/5fc28a869d4aa5b1173e60a7524f3990/40115038623.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d905c2b4de---89791337108.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c2qimqo30635s3pb6t7qjd7kvc/89537667719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=18th+letter+of+the+alphabetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ED45 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_01_sfnt_off00020326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20326 10396 bytes
SHA-256: 51818681772abb26a086e7bb06b720b79edd92f93f41544d705fc2978dd0e779
font_02_sfnt_off00021aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21AA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000232b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x232B2 17752 bytes
SHA-256: 702422a3389b4f2dd4e497ceff4e405caf782358e6ae17bec48249fd91e84fce

Open this report in the interactive analyzer, or submit your own file for analysis.