Malicious PDF — malware analysis report

Static analysis result for SHA-256 d390dda20a6d3383…

MALICIOUS

PDF

89.3 KB Created: 2021-08-15 03:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45bc6250c69f77696090428c40feb7c2 SHA-1: 1869f494e3da997e5d2e8614626ff04019e4414f SHA-256: d390dda20a6d3383e439d2408ce2060502f27910e4f3b39d0addb5d2f5e39f2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an attempt to redirect the user to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vipforiraq.com/userfiles/files/31368702952.pdf In PDF document text
    • http://unitekinfostructures.com/userfiles/file/26705202710.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6592a5fc3---wovaxowunexemibozezasos.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/79464295302.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wapefusogizoloresulap.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/pagarebigijisuvopegi.pdfIn PDF document text
    • http://jngf.cn/files/file/zipozofabetowigole.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060423473370.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df9483811e---96224266186.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/t50u57mbon6c5olab7qn1ikvb3/dixediganesavukatelotor.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/kugewir.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108208e308da---50637755306.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/15189006358.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6c129e39e627c8388db3e29036842ad1/setukop.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3b0dd62716e08b8748262f58d7643fa3/saladekogiludewijegi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceea911a1f---7587980992.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/muvefipaw.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/84300573032.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/11391308858.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/vk3vufitdsmiikne0p2nla92he/94352935492.pdfIn PDF document text
    • https://signika.pl/Upload/file/83123856152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=coca+homeopathic+medicine+materia+medicaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b35.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B35 17816 bytes
SHA-256: fa30fa674f7875140623aa45d62958ca6b4c7d7a886d85b51efb9b9887791971
font_00_sfnt_off0000dbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 18052 bytes
SHA-256: d60a4ab7c2168caa4ea1fe7f9c8a0999325a97ccdbc832997e665841ec0b2440
font_02_sfnt_off000126cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CF 10596 bytes
SHA-256: 59e32bd94d733a5412ba515d3e07370be71fadc866560a8190ac462a96d5b9fb
font_03_sfnt_off00013ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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