Malicious PDF — malware analysis report

Static analysis result for SHA-256 c28e5795c15a7a6c…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 23:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7791b6b999b29f74bfa6df1727cf56cc SHA-1: ee2fd9d56ee5eb1f0cceca4645b3ca2cbca15ce7 SHA-256: c28e5795c15a7a6c6d33d9c1852f347ee4906b7667a2b7150ef0d633cc192f9e
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing operation. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were explicitly extracted, the ML classifier strongly flagged the PDF as malicious, and the presence of multiple PDF-specific heuristics related to compromised uploads and link farms supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mintowncoffee.net/uploads/images/files/vigezewupapage.pdf In PDF document text
    • http://itkaufmann.com/images/fckimages/file/wafuriv.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/24893465116.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/penujolarajoz.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/11213630623.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/fibor.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/55793882641.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/tazuridebupitenipufaz.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcd7872572---62460615392.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/mokumalijuregabolizoma.pdfIn PDF document text
    • http://saconsultancy.com/userfiles/file/wenebikumutume.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/16613159378.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344b4a20a9f---59178549863.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/84438920106.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/72513718145.pdfIn PDF document text
    • https://badrivishal.com/media/nevadas.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/jotugibowopefojelego.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/71758865544.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/buzuzojewewidikejobixo.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/39718682152.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/12363978186.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/35639932440.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/wamunotopazabagorole.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/f585ffa5f70864cd38f8e226a8884c7d/fazafakofawamuwol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+add+your+own+alarm+sound+on+androidPDF 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_off0000dd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0F 18144 bytes
SHA-256: 60f25e02d7361ea352eccd7c1f16f8a11f1c78adfd7d179eb2b3fbdb518261c0
font_01_sfnt_off00010bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D0 10568 bytes
SHA-256: 87d061af1552f24600f426bfa599dcab2eff2b3649ce90f8282342397c2b20a4

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