Malicious PDF — malware analysis report

Static analysis result for SHA-256 57bd191906d2a7cc…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 19:52:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 921de1a4f0715eaa7718a5e2ecc9b5b5 SHA-1: d29d23d01e3773583237814d82cf6cc2bb4e52b2 SHA-256: 57bd191906d2a7cc40d0ee1415874fe0bc33965ebdb9b3ec43917fa61997ec9e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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 https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/77f93806f659001743106f4a6f76eae9/sijixigebepoxadanajewi.pdf In PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/powajaludozuzaruj.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611054f4c68b8---pedepumimavozorolupuwit.pdfIn PDF document text
    • http://canadanur.com/resimler/files/77230373152.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7189b91ef0---85523632731.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/96104496990.pdfIn PDF document text
    • http://cy2hand.com/userfiles/30801604011.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607021e652d38---tapotusigomibidu.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/46884003134.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/12554663369.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/suxofewe.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/22859453449.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/14b496875a4379be51509a697459c41e/7552231660.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • http://01host.ru/userfiles/files/fudelefibilisoxi.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/31884313877.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/matitegebizejara.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e93128247ec---jegixatilomodakabevavor.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/sisitufobapaxumowegaje.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/tumowuki.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/2542326679.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606eeecb57ace---gufemasivosigigejov.pdfIn PDF document text
    • http://northphoenixmustangs66.com/clients/4/4b/4b49b54eec06ebba3741256e9f3e6f2b/File/kofogafut.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/8301939906.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125ea7a72e95---josen.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/nqthqjqjog8pmr11po8pfkuvr2/jabizemuzoved.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/solopoganut.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160985f74d0f47---bedoxeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=restoration+drama+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_off0000c18b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18B 10656 bytes
SHA-256: da520ad4ff6821b9a4a5c8137724664ae1542a3149de96a19751490ee2a53a2e
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 16368 bytes
SHA-256: 1674109eb2569bd5647d5e7f8e74a2c8f23a51a068aa00cf2c6837e047e6081e
font_02_sfnt_off00010451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10451 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1