Malicious PDF — malware analysis report

Static analysis result for SHA-256 68fbb275f2084571…

MALICIOUS

PDF

88.0 KB Created: 2021-07-13 23:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 99d1ed310f28adb1055828bbbb6f3697 SHA-1: 442443bd6c29ca39d27af7d61ea951aa0d9977bd SHA-256: 68fbb275f20845718d90149c1c7034697d256e0d75e4ff70f3c0cc624761deca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

Heuristics 6

  • 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.
  • 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://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d86ed8bc32c14d83e9ae8cda0ef7a3e0/51668525757.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5501f3383c930d2e7bdcdfc01a762217/91787479257.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/21882510104.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ec9d1b9bc75---samug.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/43d6bbe30e4ae7a9364b256c35045531/69769973944.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/41542377296.pdfIn PDF document text
    • http://jp-cable.com/d/files/mumukonuxikil.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ludefaluzajaw.pdfIn PDF document text
    • http://kutyasturak.hu/images/files/28232248684.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b244d2dd319---61253670010.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/3fe7a21b1094341b29d185d7f10b2902/13459327150.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/74889048131.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c53cd1211---feparisegowusodirodader.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/69607638239.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/p1ev1bgpunofleeac4ci3sfc9b/rojabaw.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/378a8giv5l90e87faertufq2n3/17470970120.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/do7s1s1f89ep3gnnoq7odv9g34/xabovegixomadupelewasaweb.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d57a0236ed---62548889663.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/80971324830.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bee037bec7---kogor.pdfIn PDF document text
    • http://cy2hand.com/userfiles/50415446793.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=different+types+of+font+family+in+cssPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE959 10756 bytes
SHA-256: 101fd1ffe9e12c0deb9c2bbfbeaae91ce154e939ba6c9bf7769667ebe97f18c4
font_01_sfnt_off00010223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A35 17732 bytes
SHA-256: ff10a0e95b182f1891a2b7ff51623de5adac97c31aed2d26b99d619dcc211d48
font_03_sfnt_off00014879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14879 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8

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