Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae799672b2d8fe9…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 08:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2ed79438d4784712ae661cf13cea3d32 SHA-1: ed370909d2b353ad78d77717e5d8753f08a5ba56 SHA-256: 4ae799672b2d8fe941e9218ac2f3144d476e76a698fe635dd5d4f2a920be5ff4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains, likely to obscure the true destination. The document's content, though heavily obfuscated, suggests a callback phishing lure, prompting users to call a number for support or to resolve a billing issue. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=owners+manual+rv PDF link annotation
    • https://syteq-pro.com/userfiles/file/pasukejedarunenowamula.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/belovu.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/55708534211.pdfIn PDF document text
    • http://aven.su/userfiles/file/banefijagogasoji.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210626_B2ED99B43A681B9C.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jezedanivopamiv.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/regijomuzakoniximikixu.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/b8af02d262e1eb46d4fcf3243ac6bd40/kumowidujebasibeduv.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/88d3423b3f4f78c6789f2080980e7feb/gebudiro.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/90453934618.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a0936a53---vefaruz.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b1746aec---8848590978.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/64145525858.pdfIn PDF document text
    • http://houselandia.ru/files/fizemarogaxakesulan.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/23642740744.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ugtv5t8vmsfrf6e8djol1b70k/63611161142.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d1202687ce655219231580a13592c75e/fibatubusegaz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160730bb42cb0f---43898033383.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/aecee7ab93fa382f10e8aa4ce881d229/73091701794.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/35367084052.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/aq849i7nu4aj8m7vdtroaom9o0/boxefuxewegi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/23db5cf6e8fa886a3b07b3dc6fc6dcef/juriruraxewofewemifor.pdfIn PDF document text
    • http://i-dron.cz/data/file/safubidakajubosajezezit.pdfIn PDF document text
    • http://keacg.com/upload/files/74919490340.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 10236 bytes
SHA-256: c200e15a16591ccc0c87c731af58dbff2a26a4d380002d54adb56c8976e15b02
font_01_sfnt_off0001096f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 17608 bytes
SHA-256: 9013e2db5428a223ff075a238edba258f60ef58e2496e8d1f44b8078acb3f6f8

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