Malicious PDF — malware analysis report

Static analysis result for SHA-256 5186ec4681a48609…

MALICIOUS

PDF

82.9 KB Created: 2021-09-05 09:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdc24de5b1ad9320e9d5a21bd03dae2e SHA-1: 2d99e15e8a1326e36d523bb8dc9d873292343a03 SHA-256: 5186ec4681a486099abd4184833e31d431a8fc4d25bfc4f04d00e0e05d0c0de9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to other PDFs hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the structure suggests a link farm designed to redirect users to malicious content, potentially exploiting PDF vulnerabilities or serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/c2ih1rufpuaioju7q3pdfrc8md/pawelutebi.pdf In PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vukuretoxam.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/mokizujuminega.pdfIn PDF document text
    • https://mytopics.it/uploads/file/xofojisugirujumakif.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7104cf16f---rixivevinizijaxonowoju.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/2ov20l12k455utjtuuno9kjnqd/27941072202.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/moguroruredawedakivoruriw.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6eea38eaab---36586610238.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/wopanivozexovibina.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/sifewubewidirasumomid.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a0315ddf---faxofitijalitexefatenelup.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/1286030015.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/60762235993.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/amvam09tsrnlbngsiej70lf6sv/62339048118.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/savape.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/48266244905.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/labeluvarinixav.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b6cb6eea11e---wiropejekevede.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/88089377620.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/d67e8ae2bb97157842c2bf72f3866a78/31790570769.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b3c942b783b5f48dff18a152aaeea690/34344730997.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608217c55bfaf---50289582264.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/47444509720.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/sixepegawotu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=pokemon+sun+and+moon+strategy+guide+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_off0000d9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D2 19468 bytes
SHA-256: 6d2a30e7b20241e871623a768666f7ee65ad077d5389cb778e90184185023f95
font_01_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001242d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242D 11100 bytes
SHA-256: 29a2eb1ab2f08605c8d0241e06e23d89b58e642c891b26bea414181a8835904b

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