Malicious PDF — malware analysis report

Static analysis result for SHA-256 592094f2a8f8402d…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 16:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 41966a20f17db21e1bd90c03deb4e953 SHA-1: 7db743e7aa339d6c0030a5eb99630365f12d28b7 SHA-256: 592094f2a8f8402d45de280364216945be94d87d65c977c1d489c98d744a27d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://tonyprins.nl/images/uploads/file/vatesovot.pdf In PDF document text
    • http://topflexsports.com/uploads/rogedodaza.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/22706633336.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614cdc8b84b5b---68750657088.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/50474132942.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/jisobavejijujivefosifuxej.pdfIn PDF document text
    • https://gencatakan.com/upload/file/jamegilibunisebave.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16148be23b0cac---mijepuxerobatevo.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xifumuzarajagiposawuw.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jakuba.pdfIn PDF document text
    • https://pustelnik-budownictwo.pl/ckfinder/userfiles/files/44993586661.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/takisuwipesukolapanuledi.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/80945814509.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/81370285685.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/46086968766.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/89566053915.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/bogilanakoje.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/dumuxu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16134d82b6c5bc---getobumolamatiku.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/mudowudadinulega.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/rusobafovareku.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/bewudotupoge.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/88387019214.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/42049503362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=android+video+player+with+zoomPDF 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_off0000b002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB002 10796 bytes
SHA-256: de977228101161419d5b20722f7c7972ae8365a0bc76890d97a07029088593c2
font_01_sfnt_off0000c8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e0d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D4 16676 bytes
SHA-256: 391c4c9df22fc29420ae757bc7be3ed4744756cb889e2d4c571bb5ca965d1a6c