Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a91873cb35fe01a…

MALICIOUS

PDF

92.1 KB Created: 2021-08-21 10:21:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b8821851bb9957fa441ffc4c85c3f780 SHA-1: 0e07c982ecb5cf8fdae3cb61fb0432fbceed282f SHA-256: 4a91873cb35fe01aed13e2f0d1f177ad0f59526e594c0367ff96094f2fd54f11
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. No scripts were extracted from this sample, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/5c99a7d35d247673d363854564382c66/89027542366.pdf In PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/xazowisozow.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/41000062485.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/62925619223.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/veu7odtspq5df8spomlk91hak7/56526038555.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/93996166940.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/3125403750.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f48f16b53f4---31531956867.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/poxug.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc8ea0c7dc---bijodako.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/8723704678.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/maxewed.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d40a90bbf---tukotatolejugi.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/zijon.pdfIn PDF document text
    • http://pol2-simf.ru/userfiles/file/motilojawodokuwokulesaxun.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160842ba633985---70241903810.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607815a2ecc34---romikuwalapizisubi.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/zaweretewapufetazatapuz.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/66127726338.pdfIn PDF document text
    • http://www.domplit2006.ru/ckfinder/userfiles/files/4643998235.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e6d4c09d---3473132167.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/fanivowuzuf.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/mifeki.pdfIn PDF document text
    • http://slsnn.ru/content/file/dabubodole.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/gakoxedir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+attach+a+louis+vuitton+luggage+tagPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off00014121.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14121 19400 bytes
SHA-256: 3f7daba02cb0f533b8ef4fa829b1fdaffe98a6bce94d1edba54887167865fb66
font_00_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 17464 bytes
SHA-256: 64ed3d95cf0a26a522626ab826f8d2c35c7598d2f9e09468f78c2ff2c6dccece
font_01_sfnt_off000110a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C0 10652 bytes
SHA-256: b53a6b0e3581ce8f6cc64240bfa5c50132f0555eab11e9b08d9c62dd698f8ae6