Malicious PDF — malware analysis report

Static analysis result for SHA-256 4697e8f560a76a54…

MALICIOUS

PDF

116.9 KB Created: 2021-09-17 09:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5498e59be20967ab96e9779008dab961 SHA-1: c7824dbcc569c513fee89233067a1f9cbbe364a0 SHA-256: 4697e8f560a76a5404eda7b61afd6afde3ac0a2c26ea6b10e62fa8a3276860a4
164 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate attempt to create a network of links for SEO manipulation or to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/b58ae2f28cd8827aa3f710b026cd1a7a/91789117798.pdf In PDF document text
    • https://charterboatdeliverance.com/uploads/files/begenosis.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/fuvejumajobu.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/98334091905.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/kuditopegox.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/83825655916.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/18291962766.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8193860046.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/tawijejanolibonelivu.pdfIn PDF document text
    • https://topupdana.com/contents/files/85883974838.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed40e634e2---93700432713.pdfIn PDF document text
    • https://projetovm.com/uploads/files/pujalosidugo.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/72873888384.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/34502477088.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/2d07b4773f23b0bf499cdd6219c47e30/xukexutep.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/90101116468.pdfIn PDF document text
    • https://protrialse.eu/files/files/29139009659.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210910030353595966.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/semuxobuxeran.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/17437009556.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/magesamaxidofefetekap.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/40244506092.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/15428467824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=sim+toolkit+not+showingPDF 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_off00015f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F1A 10416 bytes
SHA-256: da551441117d5bcc45580c924f81c406f35dc422891b72406c61791ff2033183
font_01_sfnt_off00017679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E8B 20840 bytes
SHA-256: 25996c3bc99a0af846cd0f57bc47616b50cdc2f5ac942835ee51d951a4f8d90e

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