Malicious PDF — malware analysis report

Static analysis result for SHA-256 0acdd71a0bee5dcd…

MALICIOUS

PDF

85.3 KB Created: 2021-09-09 14:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a536ebd09d91cd2109d085e9aac2f07e SHA-1: 9ff91a049e011586029bba8261528bd1f63448fb SHA-256: 0acdd71a0bee5dcdb0b95f81f86345b1d2876acda9878074f6636329308ab79c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF viewers. It also contains numerous external links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://atputasbaze.lv/images/userfiles/files/biwanada.pdf In PDF document text
    • http://sinorarechem.com/upload/files/zomagejiniwamopigoge.pdfIn PDF document text
    • http://sql110.com/pic/jofuwosuvubigokusabezeku.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/vexuvijen.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300935032c4---gepidipesenuwukunuteseja.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/41301861838.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/nizakimikafeji.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134900117467---35311337757.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/63453005837.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/28531260781.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210904040115.pdfIn PDF document text
    • https://perfecthospitals.com/ckfinder/userfiles/files/wusadutakozidu.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/xonulek.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/93607613114.pdfIn PDF document text
    • https://kawanmto.net/contents/files/jilogedirovulitul.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/161314f607a78c---xofesa.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/67614933210.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f627b8fdd8---44628484078.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/60204924769.pdfIn PDF document text
    • http://inistor.com/ufiles/files/81960111914.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/vutakozoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+long+is+chicken+good+after+you+cook+itPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/1830437534.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 11136 bytes
SHA-256: 7b2d018749588542fcdc58f314b7f716f2052ce3cb40734e1b9d8d14c89dda39
font_01_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11974 17896 bytes
SHA-256: ed0551f9dbce466a36e4bf920bd0e2e985a00e1aeb4fb37881941d73b93eddcd

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