Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9a3af663e2988b…

MALICIOUS

PDF

86.5 KB Created: 2021-06-26 02:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 25fe2f21c6a109045d7cb90051ca0949 SHA-1: 0af58ef5eb68db73c3f611729acb52baaa0927ef SHA-256: bb9a3af663e2988bb6d2c20cfb73198e2f4500169dbad77a0219752e010df07b
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. It contains numerous links, many pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=temporary+parenting+plan+template PDF link annotation
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e9cff3e83---penotapas.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/polositod.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17021547663.pdfIn PDF document text
    • http://yilip.net/userData/board/file/jaxazivoxobigamif.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbbff07286---zulinotalarokubefase.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/rugetetugepabuxepime.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/90b4k8h71l020vnkc03bh37pol/43733111031.pdfIn PDF document text
    • http://mldinsaat.com/image/files/31752060506.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/nonibumowetikedi.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e61191d5---80551054578.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abe54e27d78---57330187265.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/53681161641.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/21704442634.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609447a574e38---zuxevexigipasojividur.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e60744ab845aa626c1a75fc6b19fcaeb/95943075969.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318309842b---mufawotinafa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe12b9004---69758457802.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec434ae5cc---nofizokoxogumeka.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/43775560718.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2ef00be8571bbf8eb73dc655e39f70c4/zevijatex.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081ab59344a1---57118371844.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/zelawejirofi.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a8525995b2e---22369305505.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/00e4eb7d95759c9ae6d091c44c79ac7a/25607857202.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/77440185595.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_off0000f1b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B6 16544 bytes
SHA-256: 4e890df3550d6fc8bb4402e247578530422fea4dbefb728aff08512543a63407
font_01_sfnt_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10504 bytes
SHA-256: cb43481aa8eb0ac08cbf728e529a4cef361cbe6e4cb65a86c7bb4251c5d29776
font_02_sfnt_off00013499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13499 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1