Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a5884fb4515468c…

MALICIOUS

PDF

72.8 KB Created: 2021-09-05 14:47:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d14f09064e5fe6cf375dc72f326bdac SHA-1: 7f01b7bf8c3c1454d71870632c5c706c1073aeb5 SHA-256: 1a5884fb4515468cd41790876c20ef3fb664bd39f1757c0a46173549a233c128
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076b0132e460---56956077018.pdf In PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/5dcdd0f2df50b1decd6e1f33efed3e86/lefukedapexipokonumik.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/89174487899.pdfIn PDF document text
    • http://pvvc.cz/files/22292979475.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/94980226112.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/80143721203.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085332690955---lusazanawiraxefeput.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/jixaselazikox.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ad12ec3e203b45ab508928d35bdbc2cf/71616161712.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a05cfbbee0f---28089762922.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/43799423367.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/61173888734.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16112d885ed023---51010420603.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/wikolopilakakimedoniruwub.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87871a46f4660b2561ed7df0c22b24c8/78885493772.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/29055751751.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/77680417101.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b25749d54---kanezizutokideganozil.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/43519473842.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e6adb4b9fdc---38932700896.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2706d4d07---fixokivokerewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=extract+pdf+to+excel+pythonPDF 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_off0000bcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB2 10656 bytes
SHA-256: b240cbc5eba6e7847c32d79a3bd311dfb34ff45e97fd3e40392454b47b06ca79
font_01_sfnt_off0000d516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD516 15872 bytes
SHA-256: f481907c51a088aaf4aff64e698170e46fc6c10cd0f1f59f9900d0032dd61bcd
font_02_sfnt_off0000fd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1