Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc31cfb50dbe86b9…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 23:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3e0a4ba7b7572a150df40c8bc327394f SHA-1: 11716b1d4b39a224cf564f653cd37de142d74185 SHA-256: cc31cfb50dbe86b99c042330795f8572765dfc10a61c98f02ad75f59420369bf
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, including one pointing to a raw IP address, indicating a likely attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the PDF being flagged as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://nieruchomoscikomercyjne.co/files/file/13355965496.pdf In PDF document text
    • https://argumentua.com/i/file/kijidodude.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/7309319146.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/60816558262.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/70538390336.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1340f3e4---nobadudom.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/bakurodejivonakuwax.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/73695852108.pdfIn PDF document text
    • http://vucert.vn/uploads/files/59302586073.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8e8cfcd8d6231a0edca6cf52a6606612/45294514691.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/91120592335.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/51362774638.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202109171558410152.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/27748047570.pdfPDF link annotation
    • https://mcdelandes.ca/uploads/file/surekidebumonexamuxa.pdfIn PDF document text
    • http://makeyourpartnermelt.com/userfiles/file/nigogebelitinubez.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614b304a04e79---xiretonapiso.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/65373393566.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/96460875490.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/nufupudixoxugogogiwu.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/tidoxubu.pdfIn PDF document text
    • https://panama4d.com/contents/files/28995533517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=silence+full+movie+2021PDF 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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 10504 bytes
SHA-256: ff55efc9c356117583b97041bc730ccfb1036cb29e5b267ab3fda37ab512a0dc
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 18208 bytes
SHA-256: 2d8bac3a668251634b096ccbd7ab8af9c7f2a1fe4e7d14ec869b85e34e0220d8

Open this report in the interactive analyzer, or submit your own file for analysis.