Malicious PDF — malware analysis report

Static analysis result for SHA-256 bff72922c0bea97c…

MALICIOUS

PDF

85.1 KB Created: 2021-09-04 05:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09c8f5469732f59fac0b14d47b446c9c SHA-1: 1f976c34853236bc79de9c6d2721ba58db3a8839 SHA-256: bff72922c0bea97c672781b0de11e9faa68b70f4c9e64891f5490a713ea32c4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDF files hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ineke-ott.nl/keramiek-beelden-imagesfile/buteludegegotage.pdf In PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/zatasanisepos.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/689748425.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/5e9uu2ajmle3eq7be41h8fppg5/82583163819.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/uveasooe9us2r9htv9jmon6i7a/42717802987.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607860419177d---zimotudimomitu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16091093f2d367---noxiwup.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17366791997.pdfIn PDF document text
    • https://coil.hk/upload/files/dexubexirofunomusirejupax.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b357377f651---nopivadoletufapesibenedo.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/acfa80d16af3aa9ec7b810f0a41b4f37/nawuxawutimeputaxibasilo.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/97411264874.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210519045040.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/vimoroxujusa.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c67ada22f7f---zemuluniwazi.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/nh39j5gb6mfhu6dk6h07higb91/53839140411.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/86895652594.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/52184601776.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/88521e76b2c424e665f628f095528d35/18625525253.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c54375ccd9f10da7cbdcbda2b011a95b/letise.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/1107315232.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/2fv19d1i125g5b2iu330onjf1o/76350115464.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe97300690---wizejopumowi.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/31133145249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=manual+de+radioterapia+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_off0000e363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE363 19560 bytes
SHA-256: db88060a1fd9fe29b99eaf350c7ee06b7240f5698cad03ada72528d0c5868f4d
font_01_sfnt_off000115a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBA 10416 bytes
SHA-256: 66d26117c6f90f1a968c06e35dfb4db9d8b09c241133c7cfdacfa83329a011d2

Open this report in the interactive analyzer, or submit your own file for analysis.