Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d3ec53dfd055a7…

MALICIOUS

PDF

143.7 KB Created: 2021-08-02 16:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7fb0f76006eb2fded7735249d16cd9e SHA-1: df20979ecf52c4b81c49d52041f10570e8f9651a SHA-256: 59d3ec53dfd055a71be42835b7fc8b12542dc42696e85ebcb0bdd0241d2c39cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to external sites, some hosted on compromised WordPress installations. The primary attack pattern observed is the use of a malicious document to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://aliceinformaticasrl.com/user/pages/18773822014.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/vukis.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/mesopaz.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc17d29ba3---safopulowujito.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/lojopakafowalejepoxeraju.pdfIn PDF document text
    • http://siembra.me/uploads/files/wibew.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/56b08a2df5dfb49b6ee538335c0f23a7/vopobosax.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/1e148047b0c82a2ef97fe34ae022e093/nepaf.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/328c164998f584136094c52ea5820375/68004349909.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/96714314722.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16104a2496cdc0---25482244769.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/51492675290.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/zopujumekaputowozab.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160829f1d08f82---51969658452.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/99790497731.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ebb663ca1---luzukalikejenomevunovudi.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/99790372214.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/86jav1gce8buofibqbmv5ujm1t/78562182856.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/a3b1c8aa500ac83d7c4d76cadfff01ca/93584824364.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/kokepirowaverutegivab.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/babozodozagulurix.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/vgaos7i00uum71j8ns7mvib37i/mudagipiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=comer+orar+amar+elencoPDF 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_off0001d07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D07A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E88C 19860 bytes
SHA-256: 89981f33bc2414955e3d3ba02075df9bb87d13c97ae06e213f3a35a6ac1fbd2b
font_02_sfnt_off00021b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21B0E 10064 bytes
SHA-256: 6f1c250ee59af821bc5b310ba8d145f3316a3261ba982580a5920f97ebd79531

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