Malicious PDF — malware analysis report

Static analysis result for SHA-256 48a8da336d93f488…

MALICIOUS

PDF

101.8 KB Created: 2021-09-04 20:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8aac66a7a5066ad72f2aa2a24b048f30 SHA-1: 36158ed91f202603f6d7bdfd96f21de31fbcb4a8 SHA-256: 48a8da336d93f488438e5350cf224294f1c99a4cfb408420258ca81857f55120
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised websites. The PDF contains numerous embedded URLs, many of which are hosted on potentially disposable domains or compromised CMS uploads, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gloriamus.org/Uploads/userfiles/files/87563325626.pdf In PDF document text
    • http://rocb-ap.org/file_media/file_image/file/xuxefafeb.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/243420e96787c9fe60c1c9d1254a45d2/82342838297.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/42cc0307a907117a1a8ac52b1be1cf58/deworunexejadosujidavex.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/4876460596.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/dejiravejikiporoxe.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a26bc49a5e---gitatituturobiz.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/11724172570.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1609be7185dcea---topumona.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/pumowerodasofip.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/1r3o8kp7hbr3rk538o3e42rapa/99969400266.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/93957990491.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/durudezox.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/26854767842.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160833a42434dd---jirizawaxi.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/kofudinizijorebana.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c3088799---zafidaruxuvinepidikaj.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f67c20b0b0---sadux.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/xiwejixagibapetuta.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/roxawamuve.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b70fa67699081cfa809c80704482f7a0/denavevaxazoba.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/sajabololofapapenawepoder.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=hp+z4+g4+workstation+datasheet+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_off00012383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12383 11040 bytes
SHA-256: bc947b6bc6604e4cad5e26bb927297b4116a662ae27f000eeaa7be3b6bacad4d
font_01_sfnt_off00013d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D03 20200 bytes
SHA-256: 26f130c10ffa46b5e505956964363f86851cf0aaedb9558bc4d8e3d69ea8094e
font_02_sfnt_off0001729f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1729F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1