Malicious PDF — malware analysis report

Static analysis result for SHA-256 5796e0001706c96a…

MALICIOUS

PDF

81.2 KB Created: 2021-10-06 09:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d2ff2f339fb8615eb846697bab8972ab SHA-1: 53c6f6c35168570f2ddda2eedf1bc8d784c5b59d SHA-256: 5796e0001706c96af7d97ae2bd9bc7dbdc271127f8f0239a13314388dee27d0c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable domains, indicative of a link farm used for phishing or malware distribution. ClamAV detected this as Pdf.Phishing.Trojan, and the ML classifier also flagged it with high confidence. The file's structure and the nature of the URLs suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pfollowers.com/ci/userfiles/files/59532892367.pdf In PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/dexeputomazopotej.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/nejubav.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/sufafosufuxo.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/belisakitij.pdfIn PDF document text
    • https://bor-diing.com/upload/files/mewenakilupepuwuvezifuba.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/13981617575.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/ziweretufemujonufazomikef.pdfIn PDF document text
    • https://uclerbaklava.com/resources/file/mateganazas.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/sexebapimorikawu.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16155cd849ba50---dotoguso.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/76920253349.pdfIn PDF document text
    • http://oskarmak.com/userfiles/file/44112217858.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/91880994285.pdfIn PDF document text
    • https://digicpictures.com/downloads/budar.pdfIn PDF document text
    • http://rld-carbon.ru/file/82474451447.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357a740cd4f---resip.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/dapewazura.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/84157772339.pdfIn PDF document text
    • http://dmkert.hu/files/file/37396625118.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132f3346e169---58717436081.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/40411743631.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/93952896198.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sulotavifumufik.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16158900013c0c---10256971714.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=m+and+n+letter+love+imagesPDF 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_off0000d599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD599 18796 bytes
SHA-256: 476671847c976e2b347e9ef2c607fd45c84759a7f5dfde7378c2a1374e3fae38
font_01_sfnt_off000106d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D8 10652 bytes
SHA-256: 00b4181575728068502be66f12fe037a5ec654ef6e38b995206b424e08dc8fa0
font_02_sfnt_off00011efd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1