Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0130be8d991dc8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-03 21:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: dd6c0281d6e8f3f8d4fae17d1fe6c604 SHA-1: 3bc5eb0fd288b36187fd2309c80991645524d879 SHA-256: 4e0130be8d991dc85f7e0078fe5fdd0d9c31087b3b89af60b38a32491514c0f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains a large number of links, many pointing 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 indicate an attempt to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087051796ac9---vizufumozezonumovuvol.pdf In PDF document text
    • https://aneri12.eu/res/file/12187742154.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/kupip.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/bigopetibanupadilidebop.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0a7802d1f83d908257d5c93612083f73/wojufakugivurewugepusi.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bjmrp19t76cmp2ql6hf8mq18r6/janeni.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/2150387428.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dba61bb73c---77224631821.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a42b9f6551c---fitanararujerawebile.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e91f74a7c5d---7520053268.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/waxutasadizobuvanejejosa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b864826f0fe---gotom.pdfIn PDF document text
    • http://mylodge-naoshima.com/69655624977.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/sujukejozevawipogebut.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/mozudadaxotabakusopopowu.pdfIn PDF document text
    • https://congchung7.vn/upload/file/vosazasegol.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/89672603130.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/sozegafutexu.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202108180206226975.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/tepopobajiroxuxudutun.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/lifesuvizugew.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/60195553467.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/5h4gcgbu8ae2jnri06s4i2man5/96012878902.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/65c9ba141fa4a05c74ccf5ae1add6fc3/dumopuno.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102dcd2494ef---nisabiwaj.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/73a2eb68d857dc947b546028e43c5cf4/48964612583.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/9cf1ca9542f635baa38cc18fa172128a/lavesedotoweralubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=querido+john+libro+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_off0000cf41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF41 10596 bytes
SHA-256: 7a50c75919556f9e3a5e4aa21bf8f55095a4bb9663cc1fe657ec486f18817264
font_01_sfnt_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF27 19024 bytes
SHA-256: 16eae04be8a7568edaf5721ae3fe0f5bf7b6d368675ebdff7c66d1e8ec7aeda5

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