Malicious PDF — malware analysis report

Static analysis result for SHA-256 a199bf179138859e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 18:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b334188f4b58ede0dff8a5d4e474d6d SHA-1: 484f8a74f8a072448468c6fb27a7fb7f26862e5f SHA-256: a199bf179138859ee18f9f9bece60cb947f0822c7529022adf986954d3bfa06b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and a link farm heuristic indicates an attempt to lead users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://vector-food.pl/userfiles/file/82377246345.pdf In PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/pufumofonurekagofevezufef.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/38486591854.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/xonizavegufitikatoruko.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/97094078224.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1613266001e228---15341370536.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/senedemozomadeweku.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/mikatogenopojawogekosuxo.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/togugarejekebiraxeti.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e79aa5bbd8---fexozaxuledomomomaxur.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/dgk40a7nj40lks93mepp78m516/jikavosebefugakixowosedu.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091120101973499.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/49299929740.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/lifodupo.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gojozuruda.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/90947255435.pdfIn PDF document text
    • http://wajl.net/img/file/20219135920.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090916382274.pdfIn PDF document text
    • http://cissi.it/userfiles/files/91736208494.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/lomise.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a91824c60d---towana.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161323f4e77d25---regilalitufaduvozo.pdfIn PDF document text
    • http://hongdacable.com/d/files/mizoketo.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/47516260982.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/gerimowaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=apk+cycle+snack+video+app+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_off0000db50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF362 17764 bytes
SHA-256: 9d1712b6aef30a915c41eeebf3d83c4d4d3426a41b60a7a0dc97fbeac8ebed00
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 10648 bytes
SHA-256: 76f824dd9222942d31776551d30e4584ea3238a1961558a43e73877e54a8a181