Malicious PDF — malware analysis report

Static analysis result for SHA-256 f22a809121a52df5…

MALICIOUS

PDF

73.7 KB Created: 2021-09-11 04:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31667ee3fb4a9d9f77819cd5e775c4f8 SHA-1: a1332cea2a560150fc01f84ed6789eb3fc2e33ae SHA-256: f22a809121a52df5eb71c89e05534cd6e5385f307ef3a12376da92d552944349
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or 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 URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://smidgel.ru/uplcv?utm_term=imo+live+apk+2018 PDF link annotation
    • https://kingdom.vn/userfiles/file/90111342591.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c3b08c26f---1555962415.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/befaxuxosotovanutonel.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/12097080066.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/43754709517.pdfIn PDF document text
    • http://3sdent.com/upload/files/jifonubatazeniz.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/82744676645.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/71687949456.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/pepibofolakivexipofajux.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613754b4c9439---97367519685.pdfIn PDF document text
    • https://invest.pl/userfiles/file/56240954042.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/37407507130.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/42706416013.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/48888817811.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/23626913063.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/wubarebabowenero.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/605426985.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/71152063065.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/j8khknj7aqbpp4bqe3ei72s25a/gavobozejubeze.pdfIn PDF document text
    • http://ridendo.cz/files/file/60855224506.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/71136357343.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/femomiduvasikofaniredoroz.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613743f2ab55e---futubuvijiruvasoji.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/favevodelujid.pdfIn PDF document text
    • http://celesteandtorsten.wedding/images/file/35270228905.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a7fc052e7---nisolapajinafasesaduton.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_off0000bd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0D 17004 bytes
SHA-256: 77d2a3c9369bc5e0f9d1cf43e4e09514d713c758900f046e6d13b43523b551d1
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10556 bytes
SHA-256: db297b43a392c6c3151bbe657fde46b58c45806081488e9c21dffc13e0604f4e
font_02_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1