Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9f462c33009610…

MALICIOUS

PDF

89.5 KB Created: 2021-09-05 15:43:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ed39f12219bb602a9d1fe8d497ceeace SHA-1: 0f24828fa92ce3675ffb7605163d1e01cd613203 SHA-256: 6f9f462c330096101e9c19d9dcb9315c0572569f22dbdcc9de0a289dff9f4409
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple external domains, some of which are hosted on compromised CMS uploads, indicating an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://samnakthodrahassob.com/userfiles/file/xodowarawo.pdf In PDF document text
    • http://allnatureint.com/userfiles/file/11464955515.pdfIn PDF document text
    • http://snft.ro/media/file/warogafi.pdfIn PDF document text
    • https://childprotectionindia.com/lexcyberia/userfiles/files/pifejabope.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/batibimuwowegi.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/raxugeximagisu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/5df50a5fb64695f6af09e7df1c5546f4/45188015541.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/wunavafajajajip.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/24074948979.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8629cb1f8---19616652761.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jijevirirunemog.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846dbbbd8c1---79787669050.pdfIn PDF document text
    • https://electroagro.es/pub/files/35802079121.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/semuvopozufixod.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1607d14ce78439---11500455874.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d3b6a56e5b---54395807599.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/49621814109.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210704_1A5AA5A710F69808.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/nemawoka.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/65863048794.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45efbacd9---liludatibawudo.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/sikivipikapaxesewizivil.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/pivapefipu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/6b8f8dba679e4e8be08912742d9ff24e/fuwiwuborozatirazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=renault+kadjar+preise+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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 21152 bytes
SHA-256: 2225a7ee7414bbc79f7fb185306f98cd3f2b55d1f3ad93602474aca84d966eb0
font_01_sfnt_off0001278e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278E 10736 bytes
SHA-256: 840034ad29253fea2f06e891051ed309e5475c98c427ccda6c5a2bdc186143b9
font_02_sfnt_off0001404f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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