Malicious PDF — malware analysis report

Static analysis result for SHA-256 52063fa4d6a51724…

MALICIOUS

PDF

128.5 KB Created: 2021-06-25 17:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a811737c27cfdb7057bb68ad4128d546 SHA-1: 363342dff4a19c4e48c315dec1eb912e5bd46859 SHA-256: 52063fa4d6a517247ea1702fd4854abc1196ac30b44d51eee892fb25001947bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9585

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://nothingbutsafetyglasses.com/userfiles/file/zuvokutujufegazilofud.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160822304487a0---faxaperovu.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b78656536c0---24350206102.pdf
    • http://learningkey.org/userfiles/13901572305.pdf
    • http://hb1004.com/userData/board/file/bafaguzidokivu.pdf
    • http://studiotecnicodavico.eu/userfiles/files/lezum.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/l0h35qgt333bbj53takl53q71e/81737059645.pdf
    • https://louvre.lv/res/wysiwyg/file/doduduxinoviwepawuloxar.pdf
    • http://dmhu.eu/uploads/uplib/file/8174628539.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/medikulojadipositabuzu.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5eb01b5f2290a82bd2b3ad66e420e218/96939411403.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac749ae66d4---nafovifalogezen.pdf
    • http://aqbnb.com/uploadfile/file/78090698890.pdf
    • http://altelaw.com/uploads/image/file/fivikepitukili.pdf
    • http://thermogroup.ru/uploads/files/bukowotufurugis.pdf
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/ftc25q8pngc4qqiqravanm89l5/xujinuxenoxuzejovupiwok.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/bcb2b07c05d2af8918e9f3384130c632/55649585454.pdf
    • http://accessoriesunlimitedinc.net/catalog/file/dizunexadogewexawulevaxom.pdf
    • http://sergey-yushkov.com/pict/file/wavagetufisapikudideta.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607592870d7e5---fusafesovogufolotipevo.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ah4c8mt70uh1b68433jmt60121/rowosawipizamoz.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a5aac4e5508---85382364751.pdf
    • http://sva-jeanroze.com/xmedia/file/22524461855.pdf
    • http://amphorabeautyclub.com/campannas/file/powamoj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=d%26d+5th+edition+equipment
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0001872f.bin
d9536d663ccecbe62003f54334dc0df9825c0d1cdb270ef67e79c793df8615da
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1872F 18428 bytes
font_00_sfnt_off00014d3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D3A 16792 bytes
font_01_sfnt_off00016547.bin
5accd28b93f88256231765d54412dfb73b7c8b89e0db92651776be48329af4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x16547 4040 bytes
font_02_sfnt_off0001748f.bin
f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1748F 9076 bytes
font_04_sfnt_off0001a549.bin
319c3049196a1fdd5ecdd819fc47bad0435b4119e05de994db5278aa554c94b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A549 31796 bytes