Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c95a411f24e2fdb…

MALICIOUS

PDF

97.9 KB Created: 2021-09-02 19:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 91a9f11785ab717c6fb5622611c3c9b6 SHA-1: 7e8dd4861ffa127109f5bd2da7b1dffee50d1c23 SHA-256: 1c95a411f24e2fdb8d290053a547581a4deab2b41c1405f8826c5db125818d31
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ML classifiers and ClamAV. It contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution lure. The PDF structure itself is heavily obfuscated and contains no readable document body, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d365a896b48d822fe83e4c33c4b7f496/nikivobatojuwoxitujure.pdf In PDF document text
    • https://vleek.com/uploads/files/kasanagototujexe.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/84523901249.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/gewonojepuwibeninurumet.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609a247581066---91511968972.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee5c74b474---tusafide.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a9509a6ff59d01d4783f0c7b754ac863/84945920115.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/7436c88aca2e52590dd2b4167f2b8e9a/77528044609.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/84a860fc8e9932a21c22411012f3377e/95479626509.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/po59nkqne2v0d95j7upf3chlh1/37003303443.pdfIn PDF document text
    • http://balone.net/_upload/file///4467821424.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210626065557.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/tipaw.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/vatejagilijinorewotejewar.pdfIn PDF document text
    • http://educationexplosion.com/clients/a/aa/aae59ec6301d25964842a0067e0ae100/File/rifaniwofuseputagevek.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/lumuliverimopobejikudal.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c60a0e5713---kural.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e16eb6389---44112494132.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/lisurepisavadu.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/kixirepipelugas.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/1ab70ac016d9c6a1e5e17831e3bf2d5f/54940813890.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/9c53e850fa63d7de8b0ea99eb998cdfc/30096136822.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/25261612557.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/9791721965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=tarjetas+de+loteria+mexicana+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7B 10976 bytes
SHA-256: b27650b7b818ca61de190915eabc61266fa1b76438d01329ef74c0bd405e2d89
font_02_sfnt_off000146ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146ED 20084 bytes
SHA-256: 1a909ed1c1a0bbb9068414cf083e4ccc45cbf12f7212a3da396bea74f9c64a24

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