Malicious PDF — malware analysis report

Static analysis result for SHA-256 161672fad62f2127…

MALICIOUS

PDF

113.5 KB Created: 2021-08-13 11:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dd395a1b00a1c73a740b4aacdac7a6e2 SHA-1: bd98535ac9b558026c5a020d391286a574bf9b17 SHA-256: 161672fad62f2127eb0c36a2ed9a72df84eadf5be8d9a987287f1a47723e7b0b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mrpokedb.com/uploads/files/wozubataxali.pdf In PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/huslbivp4r6isv902503tmrg7b/15558709994.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/578337d72af6007226b303410207e2cf/65837796996.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/repedosaxutujabumuru.pdfIn PDF document text
    • https://arzhosting.com/calisma2/files/uploads/20304532340.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/31806446210.pdfIn PDF document text
    • https://tonitomov.com/picture/file/75842384183.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pobamatamogutimoxag.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/9a93869c0a37d2d16c4ef295177f632f/60360059617.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/wutotegiluwotal.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d60bada2949---69208549624.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16081d42aa4c26---vosojezusorimuxezij.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/d3e357a513b507ce0618c0afcbc85f22/rujidonifof.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/bcugrsqimbh0g009u5pht65fo2/legemif.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/5fff97c52fd1ee1772f13dc462b19321/sikosixegunazodavodi.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/tosun.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072efa35497b---fexezida.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210618192455680924h6ygm9.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cabbc2a700---78106577371.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/65979251634.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/dutitunolosomav.pdfIn PDF document text
    • http://sy-smile.com/upload/files/14634153216.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/afa1dc5967cf4da3e0f22cf2dddc6dfa/49460102496.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a3d92cc8c---vifisisuwevopigu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=celestin+freinet+tecnicas+de+la+escuela+modernaPDF 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_off00015577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15577 10768 bytes
SHA-256: 2c25cbf9eca486169148ce8c66a5ff27887c0796eac15cb5c1bc1cc91914ad4e
font_01_sfnt_off00016e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E3B 18852 bytes
SHA-256: 9f8bbe55a8dab58bf07c5409f1d53fa2f0a2fa7874c8b155e5f469257f616866
font_02_sfnt_off00019dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1