Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f2b9f6eae6368a…

MALICIOUS

PDF

94.9 KB Created: 2021-09-05 20:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5a0b631fc9450f5e9c8138e679019b33 SHA-1: a45449493f1d7fa745a25fec96a394f046a10491 SHA-256: d9f2b9f6eae6368a43b4be66246a9639ac26d893b96214163b2ace594ca7829d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or SEO manipulation tactic to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bigbazar.cz/is/images/FCKeditor/File/76150327343.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/0d8d4a49894f0048d9d69c273588d483/fukifetolivoxiz.pdfIn PDF document text
    • http://collectifff.be/imgdb/accueil/files/26358808067.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c51056304---mezofikulidovutepo.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/91148728403.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/2614387371.pdfIn PDF document text
    • https://andana.us/files/files/41698704745.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/1f93c1a19647bfb2ab5287975838352d/dototiretajodawamot.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/2375748362.pdfIn PDF document text
    • https://areicon.com/images/file/surujuxunisowukuwasakar.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/71096097797.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/xesukavid.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c868535f3c---88256636630.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/barowubalibuno.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/nisokoxetalu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/dujaruvusivometemapibad.pdfIn PDF document text
    • https://adikkeempat.com/contents//files/38554796665.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdc474860---81635058341.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/65206646505.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c884661b0a9---vogemix.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/kuzuka.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/38c9dop35jgum0j8nepvcc9jgn/34634522505.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/8c3bf183884b63a41448e7677ea5924e/xuwozubovidi.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/9f5db7dc009fa086e6f49ec7ab39ad26/jexebabakizinap.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073625e46a22---28186352376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jenkins+basics+tutorial+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_off00010a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A52 19076 bytes
SHA-256: 5900c8aa405197fee21f054fa766925c566e3971c8b3f9745bf1a6e24fe8ae09
font_01_sfnt_off00013c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C23 10936 bytes
SHA-256: 543de10a55e9f313172dfb670ab4cbf0e75dac40b14aa2645e8a8762193fbd5c
font_02_sfnt_off0001556e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1556E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1