Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d416094f921a67f…

MALICIOUS

PDF

88.1 KB Created: 2021-06-18 14:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c9365ea310726659a7f4cfd0f12cf364 SHA-1: c4381a813034f09f0f3c95ea7e884abb3c200549 SHA-256: 5d416094f921a67f63894e4b5378e12419dcc36c5753c49b90af4a990d8d7256
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9997

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 https://synerhu.ru/uplcv?utm_term=minecraft+pe+aether+addon PDF link annotation
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/ojr0tdpele645lt9b5sojenop6/tamejozuk.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/02d6b1e355fb2c7ac243e205a90fff22/faruvofomezipasiputabopo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34fe27336---rarazamikefamiwul.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a46b7aadc4c---nunoruseparaniz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/eba0d2ca65f7bf059e887ba6745e1e9e/ranujinipozogalefubo.pdfIn PDF document text
    • https://luminex.pl/upload/file/womudadabijevexiz.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/natanosaxegowumebiridagad.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c66e6a3db3---gepikojinefedagexivur.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a102054b5a3---54117086404.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160caab75066ea---jawavomaw.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/58994696452.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729f8df1952---wuxitulediwiwog.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/sutosibevivudediz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/gatelisovoxonez.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f392ec05a---zusejatatoxu.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/c9555c029ee9d09e162b4a3de6248c87/79568685999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 10816 bytes
SHA-256: 910d44c6d15a1c19ee69a23ea40a5ff35e513e8688152f2d0ae0af7aa6da2d7e
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 5036 bytes
SHA-256: 03b33cd048ea5e76ac4711780b39612bec9ffd5747b47ca8e4c2bbf761f21697
font_02_sfnt_off00011882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11882 23836 bytes
SHA-256: 197b1291813f21483b56513d24ce4aee7c1340423004e9b1493c7fd738454b80