Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa9cd9c516e9ada2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 12:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 516c80f94359a647ac62d4d18bfb549f SHA-1: 1a562e9898c15ed40e86d936e3a2973b2eee24df SHA-256: aa9cd9c516e9ada28448df1c051f1f2fb80eebad2efb3c8ca0b3a7457cea26f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and the nature of the URLs suggest an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://mistral-paints.cz/userfiles/files/55673525562.pdf In PDF document text
    • https://landbondcorten.com/attachment/file/b5917512f6daee4e28b1360f1d4d192c.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/rojexuwetam.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/gufanamuj.pdfIn PDF document text
    • http://vswet.ru/f/90617729519.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/49709565483.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca47326c39---mezugigerono.pdfIn PDF document text
    • http://goref.ru/files/file/xovaleroviwe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/001bdd5c7435de7c0cb56409fda90251/70675460854.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/95646820346.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/vofomaxomonosakaxasipas.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/vajirapurajozag.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/bomopatedutavi.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/vibulunexifu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/bupste4e8jm6hrepsf5ga7lkpm/62277552256.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f106e4d481---89293708778.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc393e058df---97001524558.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16084f61fa6d43---tebowise.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078bbd7b0ea5---radiwebidi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b11c79cc384---99021554868.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/73926043793.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/ad6ce203f3c7721a1a2804721f1f6986/96502694925.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/6390399647.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/65324592510.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/e34d7db8dfa2d878aae36a79b9144719/wobemozokewopisenuligub.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a4bf48d49cf3ef63ec2374882ca382de/42613379288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=sistema+de+referencia+fisica+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD420 20244 bytes
SHA-256: 4e9a96b904a5b8345cf69c38050684c10a287fb178df4a96d96d36220f2f8228
font_01_sfnt_off0001074e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074E 10688 bytes
SHA-256: 9036a4609467ce89380e7133f87130035a5d4c1b8bf847ae23ec982de573de2b
font_02_sfnt_off00011fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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