Malicious PDF — malware analysis report

Static analysis result for SHA-256 322ad8a61518d27c…

MALICIOUS

PDF

91.1 KB Created: 2021-07-21 08:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 4a2a75ba71eff88af234fa80a11ee302 SHA-1: 41ab94355d58652f5fe88ef7e45a71eef7c05f40 SHA-256: 322ad8a61518d27c827525cf90575f65a0e5a83521c535099f0ad80a097ef58c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/f4fb61434746cdd7609c4417339873f3/11241375598.pdf In PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607c21422739a---tipogefilabumipawox.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5480a04420f9a4c70966cf0797b61eb4/bupekuximixu.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/16798707420.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bd857113dcb5859ec1ccbad5bf1f27ef/joliberekirorudul.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/risufadirobukowiwisor.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/pabewixijavejufugidokaxaj.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c39b83313e7---95281725074.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/gotudonafi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2ca25811245037764143a0641001a09a/76883225444.pdfIn PDF document text
    • http://mobilephleb.com/clients/2/2d/2d2188d13063160162e6e2bbcdac547d/File/nonotivefesapo.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/nevanipufovus.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/82shm48npdrmsk7ts3qch8h0v1/29627765978.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c85020fe---mubelekisekivodipodider.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/69135853091.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6275755de---8559625592.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210430222929387351810.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160873b72afbde---jobinavofinederuv.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0f2ecb80---kapovadikililorelel.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nenusopetosurazuda.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/96114693437.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/sakotuveda.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/83398772881.pdfIn PDF document text
    • http://m4klynchburg.org/clients/3/34/34420611de4c9c7593cf5e5fe12de6df/File/dozukidegasisibibafixamo.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/rabumezidujo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=introduction+to+radiologic+technology+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/gavuvarewowitemata.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_off0000fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC52 10896 bytes
SHA-256: 48d95d559cca7d7cc51e77b2d50dbeb876da1c176d49c37f87900446ca132061
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 18572 bytes
SHA-256: 3b0e62701c7932f672bb580dd954a6e0d7a46ae38c53e29af52e3c387fe8d8e0
font_02_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1