Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd8a37c4181ceedd…

MALICIOUS

PDF

91.7 KB Created: 2021-09-18 03:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39242e7b3bc19fb242fd9ddf4429f1cc SHA-1: e44162eb3d2ed74b733529131f0444f92daabdd8 SHA-256: dd8a37c4181ceeddaa277a735e7055af2c77dc67f13aadad90d4b2cf5206f09c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://synerhu.ru/uplcv?utm_term=power+media+player+apk PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/20598824184.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406d896f035---96088331018.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/lovunowositijuru.pdfIn PDF document text
    • http://ekvatorbl.com/userfiles/file/wosigunizezotuzikoxuwogig.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/bemapenijubomamirabuju.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/jivetabuxotuveve.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/25797940297.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/31101220998.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/zaxovajanowuj.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/51245890388.pdfIn PDF document text
    • http://owop.challengersports.com/ckfinder/userfiles/files/70260672671.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/u0enm712j6746n70e6f5kjfhol/15407085691.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613edc116cfc3---zobigofodexinag.pdfIn PDF document text
    • http://kammed.com/userfiles/file/43296737899.pdfIn PDF document text
    • http://familie-schiecke.de/images/file/vutosaxosoramoxovebebufaz.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rugiwaburarim.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210906011658.pdfIn PDF document text
    • http://saluteebenesseresas.it/userfiles/files/95493125784.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/68880734791.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/aee78ca1f85055b9818f6bb7e812eb1a/pazoxovov.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/11081055574.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/98455102365.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_off0001034d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034D 10476 bytes
SHA-256: 85f3e0250f4e8add12dc98c8e6d27e96713f1a823f50588cfd84bd2d440e5345
font_01_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 17776 bytes
SHA-256: 85d0838fa599ef480e3721ab3f6a9eaa8f7cccf30a2d2f4cbcd66cdd8b36112b
font_02_sfnt_off00014961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14961 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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