Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e0b1f63376e978…

MALICIOUS

PDF

84.3 KB Created: 2021-09-02 15:29:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 881e21b79af4bb2ef1cb87cf0a3302f9 SHA-1: 8c71471ba49846dc83aa0ec299a15e612393fc70 SHA-256: c8e0b1f63376e9789934dcdb26907942cf29649d7505bf98fc585cb87834c0ed
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://saigondome.com/uploads/userfiles/file/tegafumibujejurogevafo.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3b354b6714c55caef59b197e3e2a082e/jibigorovoxibef.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/kerigebibojawomunuwujul.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160733669aab70---25800769058.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/mikelekipadunijudufu.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/t1ev8olbeq2gct9pmbgf0jj3qc/fizifurezuzudisi.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/76192419921.pdfIn PDF document text
    • https://csn-alliance.com/data/files/36189044536.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/49637886052.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/rumunitud.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tuneparizawidezi.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/53sh7f0akqsjinqjun2qv4p9ns/76851029460.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/semadijas.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ecedce41835de1155bb77623cb8ffb7/kagosikutumenoveloxulibu.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/51915207765.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/22176783282.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/46442665862.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/wufowolonotebuluj.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/jikuj.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e39b01e7---nugud.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afe65cd438f---levesibamipumumabubir.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210813170253_f6gg6x.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/luponalobukajusadiput.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=experimentos+de+quimica+universitarios+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_off0000dee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE9 19832 bytes
SHA-256: 802947e72951768f35ecc4bf533766768b57543275c6149d6ffaff49b3e8ec53
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 11132 bytes
SHA-256: c21a3e938f577a7ee7be601274fd3f65212477d91ccbfc49c5afb9c3fc63f6ab
font_02_sfnt_off00012b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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