Malicious PDF — malware analysis report

Static analysis result for SHA-256 74b44ba3885d2058…

MALICIOUS

PDF

71.5 KB Created: 2021-09-17 19:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1910d81d362bf0c1346d623725f86d92 SHA-1: 3bede0c1830dcea34b1de4ba233fda91ef592ebc SHA-256: 74b44ba3885d2058948f953d3e5ce9b3c90c2edae2701a3383d5f7b1c55bb1d3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many embedded URLs pointing to various websites, including those hosted on compromised CMS platforms. This suggests the PDF is used to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.maderas-navarro.com/ckfinder/userfiles/files/87915858352.pdf In PDF document text
    • https://hoangphatdanang.com/uploads/image/files/48795411798.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161342497d9073---80421759121.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/88153199679.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/cc73da3c451c9ec0ba115e21dd363dbd/65634263571.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/40576569551.pdfIn PDF document text
    • http://autovoda.ru/upload/files/85836423136.pdfIn PDF document text
    • http://vizcsap.hu/files/file/fetuzadurotenabedel.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54710217609.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/97377969810.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/tobimokugevutolarena.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/54064736975.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/89450069495.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614267a87eb76---57703648482.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614487f050437---mozigemamawizuzaxa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/c31aef4d65e0753886c199099e868094/88876996081.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/dulub.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d738990ef---nalazinese.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/xexefaj.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/crn9rg8tqcqq1a2v6r0a0ao61l/vitaxadojojutupusemaf.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/4137607035.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/7847509947.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/wuxinis.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cd48d4269---22156265072.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=modern+combat+3+android+game+downloadPDF 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_off0000b8a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 15080 bytes
SHA-256: eb0bc730dbf65baf2a76f59c79000712335d85acbaca166c77b3d81749839593
font_01_sfnt_off0000ded1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED1 10936 bytes
SHA-256: 55d5bb38e915bf3019ba0758621fc92001b8bd9e4ffbea1b4bf40a5c2703892a
font_02_sfnt_off0000f803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF803 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1