Malicious PDF — malware analysis report

Static analysis result for SHA-256 8487207a12d674c3…

MALICIOUS

PDF

100.2 KB Created: 2021-08-24 03:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a59a0c7906a30adfd61a3dd4924fffdf SHA-1: 7718a53bcf291a5f9ba5a0e6ecd6ed3a38b6a842 SHA-256: 8487207a12d674c3bf074b76d4f058d29154d1d7723692040fa80af832d97857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/51a8415dc8085de17ec849e974f4a761/81047760713.pdf In PDF document text
    • http://cropscipublisher.com/files/upfiles/file/lopuwepejaremojej.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23e134e45---98396400004.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/91b1d6e0421bb67f0e430b43caae0eee/27271073227.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/86111938577.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c2610d87d---92361820593.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/kumiganokasoj.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16111a65b7823c---rofevuwudaju.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/xegipasabofaguseme.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/dagoz.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/33089310871.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8jumngnhg4m2nsrpgmp78voag5/vawotezuzo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d23201e12---40114352017.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/fqgalv5m65d7s2p05fl6qkine1/punalotobelagipivuzumeger.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160728a8ae9714---34451613304.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c17e5b66a0d---38398370968.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/92005721715.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0b76055e1---fogumabunene.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/tevamomiluk.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d613449138---xodefufesomudezazitodato.pdfIn PDF document text
    • http://thaide.org/userfiles/file/febufedepirekok.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/fb9242d0e8178f079b487ed54acec81c/34161708074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=dua+for+tension+free+mindPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000f346.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF346 26596 bytes
SHA-256: 2167420db2e61a302f30fe70ad90042f6e4b770f1364410afdcc753d12c29746
font_01_sfnt_off0001235f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B76 10568 bytes
SHA-256: f63fce1dd4c574204c015832673a82d501c1d8f7e80df2e1e7beb8540011f4db
font_03_sfnt_off0001538e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1538E 17504 bytes
SHA-256: 64efc3fc513e88b2e78fa29c467edef39d8cecf8e0476839cb21e1d50e331ba6

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