Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be76ad338c52abf…

MALICIOUS

PDF

74.7 KB Created: 2021-09-08 17:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0247d8af1d5a232a8343c2e01ddfd9cf SHA-1: f5134ddda2a0ead837aaa08f82eafcbd042f2c4a SHA-256: 7be76ad338c52abf2298ab8614dd5667d88a9099d130fa235381375a67d6d30d
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution scheme. The PDF structure suggests it's a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161319fdac27ec---62176883039.pdf In PDF document text
    • http://delfosventures.com/userfiles/files/9956047969.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/vitiwerediz.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/pobekewikosefavorumo.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/zutob.pdfIn PDF document text
    • https://jjpremiers.com/files/tizarinaramikofufagovet.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109081706185293.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/45605873163.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/47298006515.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/59798465843.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/webunuzar.pdfIn PDF document text
    • http://nasledie-sluck.by/var/upload/file/71423704383.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/65743080303.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/bawexamupob.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/xubibupugenerovidu.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/47446714334.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/30768728023.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/51931364274.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/58781383033.pdfIn PDF document text
    • https://tipresentoio.it/images/file/15003974643.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/57220335862.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/mbr2ta2mjvaijtae16if3jv734/76924895029.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/wekekazavexikapuvujazen.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132392e2112e---2145582044.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/24804227440.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/97585522247.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/79040171771.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=exercise+will+and+going+to+pdfPDF 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_off0000c088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d89a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89A 16892 bytes
SHA-256: c34060b9567811a048038d19a976d61b52e50fad866a45e83b853378f803f871
font_02_sfnt_off0001038d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038D 10964 bytes
SHA-256: 7e7ab49a95e79e40f935952946d7f84d7d641382ff684803b1b8ba35c4880f67