Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff7bb17af5aa3f3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-02 01:04:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc2eb24910cecef34abccc1864764468 SHA-1: 52e8ba9365e864c62bc3417d7c51ffa4c7a472d2 SHA-256: 6ff7bb17af5aa3f3d95442d3d0323e361c32bfad6d09079b52b0c3b97abb473f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs, several of which are hosted on compromised WordPress sites, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • 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 https://inwebjor.ru/uplcv?utm_term=romeo+and+juliet+act+1+scene+4+quotes PDF link annotation
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2bfe7bcd45---36215813043.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/nebefib.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/rabelemadimosovevemolaf.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/76098606174.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/29722145277.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/3500633497.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e209b8cc04---xevodanefumibonukinigo.pdfIn PDF document text
    • https://bor-diing.com/upload/files/felezudenusujala.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/zogewuvadaxibanew.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/o7q7og5cj26bekb00sppcrit4p/rapatasode.pdfIn PDF document text
    • http://rrbrentacars.com/files/others/fuwop.pdfIn PDF document text
    • http://www.agot.pl/upload/file/wazilitojona.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb1682aa61---94845878281.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/89988262489.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b76e5a6ab---mefuresipawu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/67954757969.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/kegefulafutukebixijinuve.pdfIn PDF document text
    • http://envigest.cz/upload/file/32528591564.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/zimeniredinexogiwijufe.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6430a505da---zufivozojinotino.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072d8df4365b---93447469326.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/91c0cdc5cb8a9b8aea5424a35708f613/paxupanurew.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/udb93kc8s5dfe22kojk9c5tqm1/gezefogubavovibojixoxufo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd57a377a3---fiketufiline.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_off0000e2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AD 17980 bytes
SHA-256: 6e0acca30740d45d87df1a5abeeecd139e10c11bc23342e095e22b05d6922802
font_01_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 10980 bytes
SHA-256: 1a39736c9c6aec68687d72135b0fd861232f7496037841dc5023a289674de444
font_02_sfnt_off000129ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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