Malicious PDF — malware analysis report

Static analysis result for SHA-256 390a6ae3c6b24ad7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 09:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53de174470eb768fc9a4b86c7bcaff76 SHA-1: e9b132d0b9552affe4494b730b3b81d414f4d0ab SHA-256: 390a6ae3c6b24ad7bdf8a8672d54e7b84e77324992e90a6bf44035155d9452bf
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a tactic to distribute further malicious content or phish users. The PDF structure itself does not contain readable content, but the heuristics strongly indicate a malicious intent through its external link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://dj-venci.com/uploads/pages/files/49997026173.pdf In PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/fulas.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f2bc5665e---66847954015.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/94273467605.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/a1846b6a203f66e1b6db0944ea5ef16e/30097027097.pdfIn PDF document text
    • https://xn--8--clcp3bi.xn--p1ai/files/bujobig.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/93582580204.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/75670711271.pdfIn PDF document text
    • http://waterreducer.cn/d/files/83908894488.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/82824559321.pdfIn PDF document text
    • https://studyhalltracker.com/files/file/63682381188.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/naworokununakekuvevawuja.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/wuboxakiba.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/lomuvosajoterewobejitike.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/91577470836.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16089f3ca6ccf6---70239944721.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/fuveganajo.pdfIn PDF document text
    • http://scholl2021.com/clients/1/19/19bca4f76d5065ca3bffbfc1c67e7925/File/wobefutuzujovigiwesew.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/gujiladekuwobudiponiviv.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6772919836---87524167170.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/80200047243.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/5293213766.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/patete.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/buzajaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=rock+salt+benefits+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_off0000e439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE439 10788 bytes
SHA-256: 04393d4c8073779d3765e11764081f594673347461756c1384ebf11547abbad2
font_01_sfnt_off0000fcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFF 17404 bytes
SHA-256: 1c377b513c608972e5f3d489968dfa45c73089a43e452b8375d312ab71da9b92
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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