Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7609aa8648d0455…

MALICIOUS

PDF

79.1 KB Created: 2021-09-06 08:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b40e152f9467c5bc0b6780f5e107921 SHA-1: e95896fef90f97e5c0e8af982353406a6e3b16b4 SHA-256: a7609aa8648d04553f389a8503c332828c2ece8dd0e8fe005863b1ac8ec3945b
196 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics confirms the pattern of using link farms on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://hoya.hr/UserFiles/file/39043755995.pdf In PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/somijibegupimebuwuwikumit.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075969a0c244---42242467728.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/bageramobilibimi.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/44405746793.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/30610749314.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e58e90fa69---vamikaruxitabud.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/62895696952.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c83f5cabf8---51802417758.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/k08icva4f6s2n2cn6f97bc9hj2/52743926479.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/kemowi.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/kivujeriwivavawifare.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/pafazob.pdfIn PDF document text
    • https://jancsoalapitvany.hu/ckfinder/userfiles/files/83765281555.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/xabebanerakamubo.pdfIn PDF document text
    • https://vozilasavozacem.rs//files/fukoninageruzuvinuvuv.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/a82e570cd4fa1aedbf2be6609e837dbc/zufobesijazofakonak.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/zuluvesagojiteximinorufa.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/8132bbafd81f2debba9bbca7fc425cbd/lenesesaxumejiveteto.pdfIn PDF document text
    • https://www.htlexpress.com/ckfinder/userfiles/files/dexopesi.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/r7oitrfa8r783suodc40gu5lb1/54031939969.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=covadonga+perez+lozana+libro+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_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 10704 bytes
SHA-256: df5058f228c8b0b80e51906d9c9cb74fe9e8ac81c140c0fd629f2dd36aac3e62
font_01_sfnt_off0000e643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE643 19068 bytes
SHA-256: 572c86ab886f060acf2119431b1333b08087495cf5c7f6344712b05c99bfdc6b
font_02_sfnt_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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