Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1167969f278521…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 21:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 342e42cbb3bc6cb0be3ec86eb8baa830 SHA-1: 457ee5802eab71a9ce8766b1d07cee1d20db89e0 SHA-256: ce1167969f27852180cdbf88714efbae01224e06d14a651ed9198e664c9dc500
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to disposable hosting and compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams or callback phishing. While no scripts were directly extracted, the presence of numerous external URIs and the ML classifier's high confidence score point towards a malicious intent, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://hnhaa.com/userfiles/tnejp/files/xuwezuvapusogojisasub.pdf In PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/raripozunugapoxoge.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/bupilofupedifimi.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/tasiwan.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/81383266556.pdfIn PDF document text
    • https://educhina.mn/editor/files/80712717955.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/18485745974.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613c2a0d1fcf5.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/21912463558.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/faduwixegejuwesam.pdfIn PDF document text
    • https://bselink.com/userfiles/file/danufemexukimasize.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/73282346968.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613defebc84e9---45666019385.pdfIn PDF document text
    • https://sayurhijau.com/contents/files/watawugolugifupesibi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/pariro.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145f2477c782---73913456392.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/49774066519.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g9d8k4aehfs5b7ru0qhfo340o5/dezajilu.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/rujumu.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/64066604659.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/xepifovutulekabit.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/wukizedelum.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/zirotazobisuxakudabul.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcc4098eb2---fajosinarazajabo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+remove+pattern+from+android+phonePDF 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_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 17620 bytes
SHA-256: b1d4d5b6c39593289917afdb14a92d91902d00c13555f190f20feaf2f97071d2
font_01_sfnt_off0001189a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B1 10692 bytes
SHA-256: f0f959e1a72e35fd4fd8895ae6d30e11c604e99c2edc1750f78062d8bbfb2aee

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