Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cfb8257015b51b4…

MALICIOUS

PDF

88.5 KB Created: 2021-07-02 10:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94e4f211a0b100cd3ce52714c450fd59 SHA-1: 3ceeb8e1e532bbf3fc142ff4b8214248c023ec71 SHA-256: 3cfb8257015b51b45524251a7b893823c1278fdfcb1a625111c039b8f3860eeb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://pistant.ru/uplcv?utm_term=forcing+amaryllis+in+water
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/f0k4qcavtmpvhasb9dfuov70sl/24150539549.pdf
    • http://maslag.eu/userfiles/file/50785456265.pdf
    • https://facades-et-traditions.com/actualites/file/xuduz.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af9fe855360---83236303730.pdf
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/1af659b14b000605421b7a00d7e0935e/8532265050.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16082b840e0dbf---jokitodol.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dfce8204a---32760913982.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160714f25799c4---83172006232.pdf
    • http://namlongprojects.com/images/uploads/files/21360635740.pdf
    • https://bd-sokolovska.eu/userfiles/file/65552989907.pdf
    • http://praguetransfer.com/files/file/befexidesopavebuwafibidob.pdf
    • https://bouveau-consulting.com/userfiles/file/17401059264.pdf
    • http://dogalakustik.com/depo/sayfaresim/file/31488925083.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5fa0abe5---mejip.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/6913b762dfc2f4e9d855573aef346732/fawotewenajiju.pdf
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/1c05ab97256e1fe098694df95426a1e5/zasavatoxan.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a71ac67f---lufugakosafovezup.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609022342a696---kitiwoxugenokofilig.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ptoe6osk2t61q012tnjr2gf521/11725089274.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da747a17ef---buzemukaduvokuxejupo.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607231529e191---tesutonolikupovekiniki.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/a650c05a9bb554ea11be714c4c1ef737/11394679295.pdf
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/41707119661.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160952d7be0fed---safite.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/60c7379025d0e3e2d0c02fb206f7fcc3/bozuderulabelokozuledufo.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc7739de4b2---lijufoboruxavepefozi.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/37b59e1b5b61b38a7b9ab074857e28bb/4009648918.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7b9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 16792 bytes
font_01_sfnt_off00010fd0.bin
b8cd87828a54ef508ffde828134bb400b24d8cd883af3a24f9fd6ce47c755329
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 10748 bytes
font_02_sfnt_off0001289a.bin
b34f24cb591153b78fbb9786d3e03c181bcf1222129b445db147c1b175c9f918
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289A 16960 bytes