Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49cf72d3008e484…

MALICIOUS

PDF

90.4 KB Created: 2021-07-22 10:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0ba2b8864d01b528297be488ca057405 SHA-1: a27e08f4d5a04a39ac24cc49b531c3c339aa7a61 SHA-256: b49cf72d3008e48402c23bfba5fd78c658f428d814da303b1f16333f801fa18c
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. The sample's structure and URL patterns are consistent with a phishing campaign that uses compromised websites to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/2379d6dff49fe5812c56a093cc3c7285/bidojujuj.pdf In PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/pcml6803s1je9bt3811052f826/33561941870.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/34668478227.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r718tfdjfrkt0f850smjpi11ki/fejenelisawogitiwi.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bc85d14bc---56407868036.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/xozenu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f7bf901106615714926724d06c05203/38928560116.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/berezinukujusazug.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/13882506025.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/85995728309.pdfIn PDF document text
    • https://o-dance.com/upload/files/sanuxapifal.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/rigupiwuna.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/vimosagivevovikifodexu.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/bolurifijoxadojugex.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/31560158180.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/21a45b8d2168b430df7c83db72831481/fisinijogepije.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d96c7b832---96801357284.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/66t246udji081btvac1hbqd0n5/22246313851.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/98016592820.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5b46c3e5---morutumas.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af224d52d4d---1006821336.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7bf5e7d3b---96717279732.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/46290981387.pdfIn PDF document text
    • http://txextremecarts.com/userfiles/file/lukekidawopig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=grimm+tales+hansel+and+gretelPDF 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_off00010007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10007 10612 bytes
SHA-256: c99524554510c6505e65ca5427484830f5823d34af2dfa428498da0a9c12e1af
font_01_sfnt_off000117dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117DC 17152 bytes
SHA-256: bbbbb2f9259f1dab26faa86d3d9fd0fc2f12357e5f5e62277f8b15c3badc9632
font_02_sfnt_off000143ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1