Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55a4dc604031b35…

MALICIOUS

PDF

73.4 KB Created: 2021-09-03 17:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ae788ee7185d3ff6a3c64c380cae7d1 SHA-1: bba73237e34271d7cf92f307205753ccd2e6500a SHA-256: b55a4dc604031b354c8c3ffeb87ccc5323c4d91129dae1e9b00a728acf41ba06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ijdssymposium.eu/upload/tesaledojepebud.pdf In PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/nizavopuzefetumamapumo.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8951761554bfa7c86bfeda92186e2b46/38032217959.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/16188517984.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af87f267779---rinosopoforutose.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/sowubewejuvo.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/pazip.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/99220816327.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/20363292387.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ed51449d0---lipipe.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/mirelesolotukut.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/jumibid.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/98578654994.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/78967672986.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/xunuzodo.pdfIn PDF document text
    • http://npas.ru/pic/file/5649659435.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o39s9obk74othtfj7c9sstgvro/nupigaber.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/wazidewarod.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/10611224736.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/77351059712.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/75812612685.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/42572665266.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/ditasegogidexower.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/33a567d0c576d8c458a570b72b2bb281/43208072531.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/cc928515b9393b544e21eac81af83de5/81727617774.pdfIn PDF document text
    • http://ooexperience.be/assets/Image//files/rawufibetixibupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=crash+proof+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_off0000befe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFE 16532 bytes
SHA-256: 8f1db6824a91609ca2fa34bd1642e241d6d18a9bb0812c4a597e99ea37b6a381
font_01_sfnt_off0000e968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001017f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017F 10152 bytes
SHA-256: 904fd2552c5bf6f4732035c3ccb391eab423a1cd3a96aec47a27cd0ab828fe3e

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