Malicious PDF — malware analysis report

Static analysis result for SHA-256 84496918f7185ca1…

MALICIOUS

PDF

103.3 KB Created: 2021-07-15 12:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: cb2b9d531ca9e1647a1c40c49ca5db16 SHA-1: f4a4431fcd38f98f4a8b9cacde71a7e11900bd83 SHA-256: 84496918f7185ca117d179ff9a97b0c566293e8430d98b193d64a9f02557e48c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload directories, a common technique for hosting phishing pages or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated and unreadable, suggesting it's not intended for human consumption but rather to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7c69104c7---kulovozerovarixixidon.pdf In PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e06ab5f73a42e5fd7714f119788973ae/limawonikarijagibaki.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a81a2c8c141a63f68dd0edea78df0588/24064957158.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/panituxizuvatonu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/14510960819.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c63c52695---3103667153.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/36787925132.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/94377199137.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/voliselojujofepow.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b4bc7042a---xeketileg.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/51903975323.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d2f5f3e2---81820688294.pdfIn PDF document text
    • https://airbays.com/userfiles/file/58683706581.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609129583c8f5---84668105438.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086e82aefe34---wekonizipemojogo.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607df67b145ea---2783161024.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/sfmbcrf1pqtp3qo7u8v09fgo2q/61181570124.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/wudexuguzixofi.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/u518usofikja0k1muh0kon49hv/diguwejev.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16088adfc1e235---sefanojanofuwoxifoxe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd91b847ee4---43262381054.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/brjltmmtcfoaf3ha5qjlfch1s1/76900010477.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/36583e2084191e58697749b9d910b05e/86074744225.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210705043521.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=note+names+bass+and+treble+clefPDF 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_off00012fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEF 18312 bytes
SHA-256: 59352a3724b0ad4f3e0fb49ce6d15dc4f62ef93cb272271aec51cae353e0d6e0
font_01_sfnt_off00015f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F30 10664 bytes
SHA-256: db5d109d7a1906abbd476f8b1cda77266b6e4187148bcf83d2ca0d340ac037fd
font_02_sfnt_off000177a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x177A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1