Malicious PDF — malware analysis report

Static analysis result for SHA-256 de486ed727f6fd3b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 01:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f96fb78863838afb90011a1804cc4de9 SHA-1: 2b2f3a26060537a062bcb7cbd6433fe42381e3e4 SHA-256: de486ed727f6fd3b882da419dc0a3127f9a5e6b73f06267f477a4c636c923649
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These links likely lead to phishing sites or further malware downloads, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the PDF structure itself facilitates the attack by embedding these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://huntic.ru/uplcv?utm_term=listen+to+your+heart+roxette PDF link annotation
    • https://worldmedglobal.com/userfiles/files/damowuripe.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/pewavimesirulefozal.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e125cf17fad3fe4547a6a4f35a7d9a00/vowesol.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/gk63re7nmtsq0d8046ltsrhh80/papovabik.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130269215a62---vigosawupuvep.pdfIn PDF document text
    • http://brlairport.com/images/file/11900866825.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/tezepulepaxemolirifor.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/5872580286.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/tofalaja.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/78948458046.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141115597c72---5250502712.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/doxepitafesufazowafijeta.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/merogapiguwaxegakekoj.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/dutali.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/barimexigebikudunigese.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/84049891e46a015deb66d5ed56be700e/64302782986.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613270703b705---ralupebumejigosoda.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/aa896928924dc82f9f412eb1f94934ff/zizarixeverasover.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30697212375.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/92630413010.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/58527144169.pdfIn PDF document text
    • 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
font_00_sfnt_off0000d0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B8 18748 bytes
SHA-256: b4ce5cb479f16a374db269e902fbf7ede30e1370a5c5d392df34e4a60a602615
font_01_sfnt_off000100b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B9 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_02_sfnt_off00010960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 10432 bytes
SHA-256: eb88a4513f057aa9e74003747aa5437e3d6f86d1783b02b937caa9abe566c42d

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