Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd914102c5a84961…

MALICIOUS

PDF

79.6 KB Created: 2021-09-17 21:50:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a1510de958bd4ad3d8dda1e34c436859 SHA-1: a78802bbbca384700ea4be197c0c985c6bf16b53 SHA-256: bd914102c5a8496119a4a47ae1d95bd74b32696ece19ccc8de183d4bbf15a9b5
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, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://catamma.ru/uplcv?utm_term=free+musically+followers+no+human+verification PDF link annotation
    • https://phu-komplex.pl/pliki/file/kanokaxowuvuvejize.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/60748438088.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jiwipenarasebupitirule.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/66525606793.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/42118477823.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210905_CEFCD62386AA772B.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/66474297413.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58839216673.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/5b193acc0a1a74eba9de040ad1ccc809/kurelufiwudasodewagav.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091307152713.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/418dc8da555534af23fc3ace0ce2a25a/xotadojepe.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/kemudupuraj.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/bijukapizevosomufaxopo.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/91476208325.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adce661caa---40919593832.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/fefitowivodokokinaposib.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/8267401946.pdfIn PDF document text
    • https://annekienlen.fr/imagesfile/wuvogiz.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/sujukukilapagubenem.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130dc81ea15a---ziletagokon.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/xexawunovugulanodawe.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/88240437920.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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 10944 bytes
SHA-256: c5ccc8c0afe89df1cf33f3755205cec41f9f2486f36947638892df076fab4695
font_01_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 17672 bytes
SHA-256: ea646ec6e4aca24a8d628865026a9618773316818eed8325a6ff769be95981f5
font_02_sfnt_off00011833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1