Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5513d46ba8f4cc5…

MALICIOUS

PDF

69.3 KB Created: 2021-10-02 16:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 00fddd3746fb5723b10017541e707459 SHA-1: a6b8b89db0e86443ad96f798264766222030b410 SHA-256: b5513d46ba8f4cc5b94761c3a8891ae7472bb8c940362ebb27a83b8e4fb65ac6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=write+a+paragraph+about+your+best+friend PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161391ba24553b---tavadapariteliwe.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/tojedeje.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cff9cab30---89013940099.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/78686230765.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/runefaragupeb.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/63795532202.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/39488888695.pdfIn PDF document text
    • http://stevis.cz/files/file/vajuk.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/linolimatidalilefa.pdfIn PDF document text
    • https://healthtecindia.com/userfiles/file/15728851964.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/80915388654.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/15078657250.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/3090306977.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/18254436011.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130585c3e14e---wudojujipividizarifu.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210921064357696.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/27859714842.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/kojikobadi.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/40108152549.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/jiwuraxus.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/rizesabuzogelomexiratuxid.pdfIn PDF document text
    • https://mepho.hu/ckfinder/userfiles/files/82088358731.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/89277168905.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_off0000af3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74D 15708 bytes
SHA-256: 5bcc6f24ac4be6939c1c56f5a15c1afdcdd16ad936633f96bf7c1404275e2acd
font_02_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 11076 bytes
SHA-256: fd203175fbc6c9a33ffb35b39310877cfaf13528e699ea5f9596d78085715aa9