Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a864bbdef9988b3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 14:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d4d379d7c113d4ce0aa00f4d7acdecc1 SHA-1: a836a015eb929620c0379aa80299e425d8739695 SHA-256: 3a864bbdef9988b3c4e8d6dd1beb6f751e92ed588f7af4997b58a3206e758435
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojanized PDF. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest an attempt to trick users into downloading further malware, likely through a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/27eca763bd213b729d28d17a8e15c4a3/tosazofunaluvolaloju.pdf In PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094dadfe3485---wefurejiwotowos.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082433f45361---4683093804.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/76507047749.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/81304514003.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070ab6107362---lamosikidizu.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/71806571801.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba984787201---23781790906.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/tugujos.pdfIn PDF document text
    • http://fluorescent-training.com/file/tejonarepatawutigogefefib.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/43926855776.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/48391506618.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/bawub.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086d369e3540---29328630079.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad5d72f86---32104184366.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/fifawavumitolomatadibe.pdfIn PDF document text
    • https://rpitrade.com/ckfinder/userfiles/files/luzatuxigupekevelavut.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/noladiputolavejiradu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/cfc981bf98186908d9481fc9bafe3f7a/68595163099.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/kowulenoxakisag.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/34118100084.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/rajoxinefidoz.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/62fb97e23fd58ab2bfbb89a92b41e3b7/13123488306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=spoken+english+book+pdf+in+marathiPDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 20468 bytes
SHA-256: 77c818bf8c71eed50e232c26dc671b4e824b295fe2160a63436e237654f3f7dd
font_01_sfnt_off000112bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BD 11252 bytes
SHA-256: d86859a70df2e97a74154dc235a365dae874c1bae7c65418ed5b3a0020f8601e
font_02_sfnt_off00012c7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1