Malicious PDF — malware analysis report

Static analysis result for SHA-256 539df09a142824a7…

MALICIOUS

PDF

89.9 KB Created: 2021-07-13 22:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 44ca4ec3b876d68b6bf25c1a3dda729e SHA-1: 5055e2bb4da9557e4d2b3bcf40803df40f137d92 SHA-256: 539df09a142824a74626a9abf5c4f8338ff2bfd5547fb4804a4f537565a6c848
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host and distribute malicious files. The presence of multiple links on disposable hosting and the use of UTM parameters further support a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160860a825e7cf---76572350974.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/1026713011.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/dobozopolofunosufafuw.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c6784ca7---13345310235.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a5a2c98f5---43512394251.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/wiruvi.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5125rojorkuboseelud1mfili4/malikovolalipibe.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/74055024620.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/difid.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/551f09007af131fca752948aecd063e1/semowitinen.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/berejakapelirosujowomadu.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/laginat.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd822cff4---lajob.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/2549916466.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///nelopukimukiraxeras.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/ledabu.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/zidedixes.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607208b79491f---53399310746.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/51146301832.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/80823183201.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/27483317447.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/9821956831.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/50795537592.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874246e7a0---4876097601.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/bed0f70a38c5b34c66efccfcd27d5f37/44896614875.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81097facf---53827432372.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=plants+vs+zombies+2+free+download+apk+full+versionPDF 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_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 11324 bytes
SHA-256: 53d9ff429dfff9930aa976de4888e48b02668a7945711573304e530369b7863d
font_01_sfnt_off0001075f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 29496 bytes
SHA-256: 886fee0b3db221294449bf838e780108eaaa427c2552150c63b83af4e942f050
font_02_sfnt_off000142f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1