Malicious PDF — malware analysis report

Static analysis result for SHA-256 879c9aa832f4a5d4…

MALICIOUS

PDF

82.9 KB Created: 2021-10-11 20:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 59861a9f111dfeca1267fd95350bb5b7 SHA-1: 31c363f6155e016783b9fe3376ca9ecfdc1c267a SHA-256: 879c9aa832f4a5d4d30770a52be5a8e2ed018a5cdedf68387a311388a3a7f7a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm with numerous external URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and numerous links suggest it's designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://adikkedua.com/contents/files/98306526404.pdf In PDF document text
    • https://maxflowfans.com/userfiles/file/72916168442.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615e20f65d749---12708440195.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161557ea153589---73400643797.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/16781594411.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16162884486efa---2698914375.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/29071331800.pdfIn PDF document text
    • http://xn--q20b13r9leepaeb.net/upload/file/202110080327376785.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/03f25562970f96984018758113ee5cb1/90994134236.pdfIn PDF document text
    • http://aviatechinform.ru/sadm_files/78135420374.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/15018130631.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/jipurenebupulus.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/16256394311.pdfIn PDF document text
    • https://svltv.in/userfiles/files/50902150818.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/24425281396.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/terugeluxamefalitiwa.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/10482533880.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef2204c9fa---73771911867.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee6bf16127---pewumufar.pdfIn PDF document text
    • http://apcmagon.com/userfiles/52108441635.pdfIn PDF document text
    • http://samarthservice.com/userfiles/file/nutuxuxabebapogivewisowe.pdfIn PDF document text
    • http://gardena.crazyrockinsushi.com/uploads/files/dinez.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f90aebff53---kowufewanumowikolad.pdfIn PDF document text
    • http://inoxbienhoa.com/upload/files/51382681295.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/feluxudumuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=own+house+dream+quotesPDF 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_off0000dbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE5 18468 bytes
SHA-256: 6b7482c93edd60d76ec3bd4b4743288f88d20d4d70b8592ae1b0d91c8f9b435d
font_01_sfnt_off00010bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCC 10732 bytes
SHA-256: ad6be82d60217aad49023f4a7f0e4181d79d5daff92fa260030e426c7511f872
font_02_sfnt_off00012428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12428 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1