Malicious PDF — malware analysis report

Static analysis result for SHA-256 89729020fcc7b4fc…

MALICIOUS

PDF

76.0 KB Created: 2021-09-28 10:30:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 365e1ea7572d4421cfaf91a0d80e7f90 SHA-1: deeb3a638b1fbec2e00a7589081744f9b413fc0b SHA-256: 89729020fcc7b4fc23d7b4306e33300c7ea93d02a7f7ff249070eadd2cbc538d
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm used for malicious redirection. ClamAV and ML classifiers strongly suggest a phishing or trojan payload. The presence of compromised CMS upload links further supports the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://beautybybelief.com/admin/images/file/jokaxi.pdf In PDF document text
    • http://netart.hu/userfiles/file/35934513829.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/patid.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f524d67282---zorafaganumibavapivirax.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/mulifinadimujemo.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/8559105194.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b632c1b1a---71644398714.pdfIn PDF document text
    • http://origo.ws/userfiles/file/rodirogodusewijolawe.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/96600949729.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/pezibaduvitesogo.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/44195414424.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/bepijudufarilegovifurub.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/66016411635.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/tewamujevej.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/gusowutokad.pdfIn PDF document text
    • http://remobudostol.pl/pliki/xibofomoxolox.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/dumepalataz.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/08bdf9bd73e99c6acbd7a678a2a9458b/pikotu.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8bc09786b---55024205198.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/42026408302.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/gafafakuwepubomavijevef.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///wupenakanopoposisoruzata.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/64880510900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=episode+shakti+episodePDF 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_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A9 10312 bytes
SHA-256: aca841e50d2f1b88ea968ef8527e96b61cc1ed1578a41df8527917a36e927cd1
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 18988 bytes
SHA-256: ea35a0923dacc102c36f3141d6fdff5ce4d83b8778f85de57d145f9644824149

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