Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d3fbd7f72396741…

MALICIOUS

PDF

82.1 KB Created: 2021-09-10 12:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6255d45b05960094b4c570fe7380167 SHA-1: 403de032fef8af145260a0bfff3c138fddb7212d SHA-256: 5d3fbd7f7239674116b8258eb69f56381d6012e206addbd3b92ef9380591fbd3
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body was unreadable, but the presence of numerous external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://nergizleryapi.com/image/files/88785461918.pdf In PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/93476048305.pdfIn PDF document text
    • https://reclamesticker.nl/images/uploads/file/In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d43591a703ae0873f4d819fb61586e69/84346357662.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/lowefuximomoniwimol.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bupanorivojunus.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/s7s2vbnk2krs5bmsiah36uaegb/70836570810.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bf1ad6cd27e5713fff8a18fb85b3b9fc/71023494313.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9d749c769---gaxibitas.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/nilodowenesevusejume.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/pinaxedubakazasod.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/29202803130.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/novugeravun.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136d5e8cf570---ruladeterumefukinof.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321bb70855a---94303584980.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/limemo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16130d5a4a4c3a---kamiwiwikoxiximuxezuju.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/85774753951.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/poluj.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/53632737996.pdfIn PDF document text
    • http://design-klasse.de/ckfinder/userfiles/files/24136971483.pdfIn PDF document text
    • http://metapolar.hu/tmp/jowazefomowuluxupokasowij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=toca+life+world+1.22+mod+apkPDF 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_off0000db0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0D 18144 bytes
SHA-256: faea7e437dccce68d033e377108ac312a2d5df9135a17b63583a40c1e2ae29ce
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 10788 bytes
SHA-256: 56bc8d18fe613e45818c99de59cbbf669442689fe2911659164c6316cdefee9c