Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b4314cb7366987…

MALICIOUS

PDF

68.8 KB Created: 2021-10-02 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 324bb293620c5cd7995d4177fdef86f1 SHA-1: cc38500fefa8ad3648cf2ea59480fbc47244c7fb SHA-256: d9b4314cb7366987fade01f39bde63e972d53b5ee9e79634a12e8263987d6351
176 Risk Score

Malware Insights

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

The PDF employs an image-based lure, a common phishing tactic, to trick users into clicking embedded links. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly support its malicious nature, likely as a downloader or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://abacusnancy.com/userfiles/file/74400818219.pdf In PDF document text
    • http://otohondamientay.com/upload/files/vutazedikazip.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/22458039699.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/71212100819.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/tigofigasemibeke.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/gulowikemirewaxo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a8a1b98a4---45429435315.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161588d59727ff---22967016938.pdfIn PDF document text
    • http://dangkydoanhnghiep.org/hinhanh_fckeditor/file/58917257828.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/67840231310.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/98488378505.pdfIn PDF document text
    • http://edukoc.net/userData/ebizro_board/file/dopesogadojurasivujijat.pdfIn PDF document text
    • http://hanifeugur.com/image/files/foxojegikixevomun.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161521d3925fa8---4778689514.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/zasiwonududotexoxazuto.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/kenigazenatofigaguxegoju.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/48269246686.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/gadidifutanijomimiziridi.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109160004451217.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387846f10da---12031275349.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/52501229213.pdfIn PDF document text
    • https://tessuno.com/upload/files/614f28bfa085f.pdfIn PDF document text
    • https://investkwik.com/userfiles/file/mugewudomisawiduromo.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/92575177105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+can+i+become+a+good+rapperPDF 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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 10764 bytes
SHA-256: c218c16ccac576bd48a6fade3f74040b8d2380ccd9fc049b7eafc50daae241f8
font_01_sfnt_off0000c9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D4 14272 bytes
SHA-256: b852df4b07851082742285ba5eb67960e06dae0632afc6742a221193a74b8987
font_02_sfnt_off0000ed55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1