Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6fe035e5a998a4…

MALICIOUS

PDF

92.4 KB Created: 2021-09-08 08:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bed280fb39eebb64955942c0fdf5d3ae SHA-1: d0ce3eff9f7d6d47a6414df88378820c962e09e2 SHA-256: 4d6fe035e5a998a46089f6d29d5a8a836d6918e14919ca4c44370a8b2341bdff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://huntic.ru/uplcv?utm_term=ben+franklin+autobiography+pdf PDF link annotation
    • https://jackinthegymtpe.com/uploads//files/202108090902263871.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7c51f256---60198827783.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/nenulogolaletiwedubife.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160886df7294e6---gomelawopubufejujujajewom.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/pupewowumoxega.pdfIn PDF document text
    • http://prestopc.it/upload/file/26183110240.pdfIn PDF document text
    • https://gimenezricarte-deltabogados.com/ckfinder/userfiles/files/werubisukugawetoferur.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160815fa6d29a8---kabogelemasozemujotifejal.pdfIn PDF document text
    • https://efnnma.org/files/file/volokabinobagowulepu.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/dogetesu.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/74199305773.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/derozatax.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/373fefd4317202abeff4ed2b04b9a5c5/5408632838.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021081305465352.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/musipevavezawaz.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad85a6554---nuwojeletagamigelujugu.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/6h24nsdkdlfmm47gsjags0rfuk/97138032129.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/56324123827.pdfIn PDF document text
    • https://laps.pl/userfiles/file/7681003276.pdfIn PDF document text
    • http://srlamn.com/clients/0/00/00e84243199fd86ca7c15d66a0237eb0/File/73661086820.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/19339934084.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69f15dda62---lawufebule.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564340493e---19239634744.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b7ddd13b3---16025622905.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/75359249474.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210616045720.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845dd275d93---36244874469.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_off000106c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED6 16752 bytes
SHA-256: 1dfd30620b112ed19721fe42b74474c1bcd48123bc847f3b95185858ab4c798c
font_02_sfnt_off00014a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1C 11108 bytes
SHA-256: c8d15346c431c5d99eb494929b4c6c6b24a01ca2bbbb0ae924515dbef82f1fbb

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