Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaaaf44db82a8c31…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 01:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e5204fc1c5a1ee1127860b088523a68 SHA-1: 0705f3202cdcc5ebdd5d89dc2e1953b0838a72b0 SHA-256: aaaaf44db82a8c31570f8ea2bc94cbe04e12834d5c1452b0c577f2a3d868d264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised websites, suggesting it's designed to lure users to malicious content. The heuristic firings indicate it functions as a link farm on disposable hosting, likely to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=endeavour+dictionary+meaning PDF link annotation
    • http://keletunderground.hu/images/uploaded_pics/file/51243892253.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/15ab10d0c5dd52781d8fd530293fa237/85154091637.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e18841fd7---vepegifosalomurerox.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/28647378533.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/6776535476.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/30325621192.pdfIn PDF document text
    • https://aedwea.com/upload/foto/57914695924.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/9f1da5c9932dfc2b59f3a44ffb27b40f/basumovaweninozibu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160df58e9a7cf9---zedeke.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/9df06d741f0ff864ae0d9c5aa88b92a7/73493138005.pdfIn PDF document text
    • http://bosch-service-center.ru/uploads/files/roxuk.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/nusipexozosezufenuniput.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5de33803a---suxevofegesakimoboj.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/85393146138.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/88633726979.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/zakolatijeluwenex.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/28867660095.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaaa138238---59301520316.pdfIn PDF document text
    • https://stopserv.ru/files/file/65487123211.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/tevufotupasugipibuvod.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/visapebeded.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/c2qjke82hqdjqgl27hrpjdvnsd/12333701133.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cb8f9e14c---mufubusozeraber.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/28422406785.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/61425917649.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_off0000def4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF4 18248 bytes
SHA-256: c868fe617bf24994bdd371041efe00c6b2da88bc0513134833b4f47dabdfb3bf
font_01_sfnt_off00010e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001267e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267E 10760 bytes
SHA-256: a26d54ccd79c15be403c0cee44eef1e217fc60365c70253b373570a068586af4

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