Malicious PDF — malware analysis report

Static analysis result for SHA-256 841b2c339c42bc31…

MALICIOUS

PDF

87.3 KB Created: 2021-09-14 00:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 53c43c4e146513d678d7be9a310eab5c SHA-1: f4428bef106069b180763a7d5669cc811a7c27e3 SHA-256: 841b2c339c42bc3165f36d58f4accf399342f71c5a91e0d106f6e9f876fe1757
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to a variety of domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://irlanc.ru/uplcv?utm_term=2019+movies+tamilyogi PDF link annotation
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/mobomuvobinikuv.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/penetakudoluxesajozixo.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/84538481900.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/98915063483.pdfIn PDF document text
    • https://gangnampools.com/contents/files/zirazigufeburusagateba.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/batodevaregewow.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbc2e8d26b---vowotoralomaremumip.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109041203229976.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec2e517404---51944818088.pdfIn PDF document text
    • https://mkontakt.com/dat/file/21538052559.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3fe17519---bijoxorubur.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/83559075611.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/megofawivif.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/ridabog.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/79116763832.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/gorapuforarak.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/52684171810.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133fcc333a4d---bupazuvovonoza.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/57017477316.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109061157089267.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/25503863671.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/16062383080.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/xadogosibo.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161349c472d4bd---43944058028.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_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 10792 bytes
SHA-256: 0e08cc9a327a11fc44305516998761415777b990a046a799e540d74f9e0899bf
font_01_sfnt_off00010b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6E 17040 bytes
SHA-256: 16101bb048ec0efecef9830af9e1b5e7a0d7332b2e4bbc695526f44a8b1ae8ed
font_02_sfnt_off000137b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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