Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03993738209154a…

MALICIOUS

PDF

88.4 KB Created: 2021-08-04 04:17:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2d64982580e95e0d18592e5dc1766881 SHA-1: f1eb4c6714c1db04162366d284bf8545bfdaa63b SHA-256: a03993738209154a85b4f6f8e3e6cd2e93689e367f5af6084bd547bd551e19e1
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, indicating an attempt to execute code upon opening. It also features a link farm pointing to numerous disposable domains and compromised WordPress upload directories, suggesting a phishing or malware distribution lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://constantemails.com/userfiles/file/1626344746ronugilotuzalubuvel.pdf In PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/topavu.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/60624517128.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/pavet.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/7070500219.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6f33165747f49aabebd45a026888a976/kitobizajaxibolewejafedu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/42102185734.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/1hpld4ekg1ch1n8eual7mhp8al/xamozezezusax.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/ae146f25e04012056a093dba507b0262/12120244807.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/4vdh132b85hv999bk3fl2tspo3/93517793653.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xiwezutasamupiberitu.pdfIn PDF document text
    • http://anm-av.de/uploads/files/vofokaduwimixa.pdfIn PDF document text
    • http://hibertek.com/image/files/20210622_201250.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/banuwisifuruxoteziwekovu.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/sanazimebeguxanebitekom.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/a4898947022a50d0e7b61617c2506965/96111530380.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/wulojumewiregatira.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a3dd6200f---98641127907.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdb270869a---43859208491.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/wixepikukadowi.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/93850127255.pdfIn PDF document text
    • http://poorclarescork.ie/images/94791906011.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/nulimuxiwetonofuloxuvod.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/016ng0pf7a66q1vlb3uranrc2d/tozedalofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chromium+os+virtualbox+imagePDF 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_off0000f1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DD 17512 bytes
SHA-256: 75a2987ee8050f84ef4117d9de53c9affb0dcf0e82c622368d50512e3a946278
font_01_sfnt_off0001200b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13822 10892 bytes
SHA-256: 2d831dd9fe330ad1a2b7c6c5174724c7778c1e2c2517e538ef34dc1559f39a5a

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