Malicious PDF — malware analysis report

Static analysis result for SHA-256 5107a41954718f37…

MALICIOUS

PDF

107.3 KB Created: 2021-09-08 18:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 74955d8727cd5cf25ea2e7a98d55b515 SHA-1: bc00200880bf34c2e912c36c82e9703f8ef681c7 SHA-256: 5107a41954718f370ca509b62e22a5fb9077e9cc7e548d75d412aa731bb0ffd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9881

Heuristics 6

  • 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 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 http://dezis.ru/uploads/files/rutopo.pdf In PDF document text
    • http://gradn.ru/uploades/fckeditorfile/nifojojularujulosikigase.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/betawiripatapivunonup.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2619f029---dobudizizamuxupidowi.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/kipuzo.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/46084573707.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/76928428029.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/namezujerezolazowufowa.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/4724064803.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/lonemifepazu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/68068108396.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/geregisoxonovijowu.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/sawunusopipurol.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d6838b7d---16017810124.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/2085245456.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/86426364151.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/57749940499.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/18047386319.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/96669022464.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jodijoxupoxosaj.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/1286340937.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/52771687298.pdfIn PDF document text
    • http://stisk.com/file/6237512223.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/zisoje.pdfIn PDF document text
    • http://ttc-investco.com/img/files/39061807332.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613332aa0fb8a---94101839561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=chord+progression+map+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_off00013ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AE6 19936 bytes
SHA-256: bcdef3372045f96b001780da8e01e4d018535497b1160b1d2e2a099b34d50ed5
font_01_sfnt_off00016ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA1 10832 bytes
SHA-256: e049de5694e928940091788ca4f896680a7fd691216ba3a08d2a0c92be0955c4
font_02_sfnt_off00018733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1