Malicious PDF — malware analysis report

Static analysis result for SHA-256 9429a5812862bcc1…

MALICIOUS

PDF

106.2 KB Created: 2021-09-02 09:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 57ae362d14ea51b125d8845f20fdf700 SHA-1: a557c735ecd58f294348867f4aaa37b000f1ae82 SHA-256: 9429a5812862bcc17b47315e921e870df91d31f5d3b1c023eb78e95a848cd6a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://wastran.ru/uplcv?utm_term=another+way+to+say+do+your+best PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/m1h5rd7cmkujtmnug40ilval8j/gadid.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161072cd9f064e---joruja.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jidogugapizoju.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/593d8d7175c3b998075626ab36a11118/perotadevosax.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/46823202787.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/gezuri.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/78093000182.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1611c4c3c2f2f8---tavofumaluti.pdfIn PDF document text
    • https://sjalikave.hu/pictures/file/86195782180.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/66833828184.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/874fe46386b8523a34d48985d084bb4a/dezizavafamipobifokogafi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16089d447018e9---xokamolefekuratiw.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/52759032521.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/84380051571.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/xowepan.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/41477749734.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0ae51bb8---tosesakijakuzafet.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/pavurimidefefifaxigufo.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/508e6b88116e532e29c1090cdd4fc541/rugalezeli.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/7815b3a83523ec013d5f4a501e339907/jaledejoj.pdfIn PDF document text
    • http://manvilastrust-org.bvirani.com/ckfinder/userfiles/files/91764125844.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/bajegeligujib.pdfIn PDF document text
    • http://fullx.net/files/23514357222.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/masipabegunufawo.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_off000138d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000150ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150EC 10628 bytes
SHA-256: a1030b28d6899746f7b68af540d1bf536d40bed70897ee5a3cf9bb94fb01e396
font_02_sfnt_off0001694d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1694D 19188 bytes
SHA-256: 6be08315a37fb17e246aaf1bef45f4b0f1b17e56f5503ca930677322f16a104b