Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd7ec110136f319…

MALICIOUS

PDF

78.6 KB Created: 2021-09-02 22:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ecea36dc75f1c65671c3fa67852f8773 SHA-1: e4d31f2763364daa55a2e570ba9b783a53d5cfc9 SHA-256: 5fd7ec110136f319f2e93c55dbbbe558e40bcc50620d1e5d98e9ccb1e16925ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/5191592008.pdf In PDF document text
    • http://castudio.eu/userfiles/files/63008215835.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/0d1423d7d785e408c18605fcd5f11b3b/86757808475.pdfIn PDF document text
    • http://mahnomenalumni.com/clients/879209/File/70149380713.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/25771232782.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/nelege.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/19604191211.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/25422542581.pdfIn PDF document text
    • https://aneri12.eu/res/file/52539157072.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc2e1cec0---duzozutileguvowemuxoxasa.pdfIn PDF document text
    • http://1970fchs50thclassreunion.com/clients/1/19/19770213778af891f1b13fa25f964f50/File/mewonima.pdfIn PDF document text
    • http://novafish.it/userfiles/files/fafijagomipobosodusuxazin.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/75064357259.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/madufuxawokas.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/dizusadibil.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/a6i4gt2cnhergf4pjsk8k8d7ok/sidilamorenufaliw.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/4b6474f6ab5815d90be491ffb0460b9e/3760083794.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/pekimepazuvi.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/87456992491.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/92a7a76e851e1bce6054252c713855a0/30655433601.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/begokamosuganipivizemu.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/kuxuwevezewezanu.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/wukutut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=irish+fiddle+sheet+music+pdfPDF 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_off0000d11b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD11B 10552 bytes
SHA-256: 8306dbec8c5c55c55537bba6a6e009bfb6c59d877e01cd5ed51a7044fc1c4f43
font_01_sfnt_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 17044 bytes
SHA-256: 3a20e222df2a40efa67c49df7bcbb0b76ee3e8963383e363fa92f6da6d222299
font_02_sfnt_off000114c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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