Malicious PDF — malware analysis report

Static analysis result for SHA-256 542c19303e70267c…

MALICIOUS

PDF

130.2 KB Created: 2021-07-18 12:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 57d27194d1a755b31f38a2200de0f6a9 SHA-1: 3081b1c889d8a36d78db447128930c9a8ed4d2a6 SHA-256: 542c19303e70267cdb8bcf4f5de74f6ae90c0183425149eb7882f099533bb720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The presence of multiple compromised CMS upload links indicates a pattern of hosting malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9845

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.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b97321c7a---85023504926.pdf In PDF document text
    • http://inter-travel.hu/_user/file/14881021205.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/73341665709.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/79425815169.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/18555403013.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e32b91c258c---kofopetokepidosabuv.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/5773415582.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/273421374.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/53145085463.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/24180084172.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/f5koj71c9kt23o3btqgq1c7rn7/10083199534.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/zufipixi.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/e0as2vm9c13svl632cu4lk7ljm/fidamabamisitagaxux.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/wovolijitejetukeko.pdfIn PDF document text
    • https://marosme.ro/hirek/file/zagetudop.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d01ab62707---20176146570.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160baf8f41d0f1---69396082769.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa5c60272e---32607638413.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a10869c9---47430497872.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb3be9e930---wuvimefek.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210610013438.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071315cb1320---zuwitowepixote.pdfIn PDF document text
    • http://caramelitos.sk/files/sotamawururewa.pdfIn PDF document text
    • http://sooclose.eu/upload/File/wofabawudiv.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/7c6611f35fca5d8ac68d80fbd45cd66e/30425386890.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a292032fb4d---pikipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+division+of+powersPDF 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_off00019b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B98 10404 bytes
SHA-256: 73c62dc0b9b435c5bfef70402aa615dccaa8725f5ca3e288776a15de505ee34d
font_01_sfnt_off0001b321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB33 19564 bytes
SHA-256: befd8da6ca2fd5554ebb955537ea3e6e6822b07610bea78ce9cf27e8e294279d