Malicious PDF — malware analysis report

Static analysis result for SHA-256 db756663e50562d2…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 22:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9718fbf0b62bba7b7cc0aad873c046f9 SHA-1: 224e7a28ef412b2e74cc510f17b807934c1740e9 SHA-256: db756663e50562d29c1ac82dbe381fe3b5891bcba260a68b74a5f9c69c6bd212
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=alternative+browser+f%C3%BCr+android PDF link annotation
    • https://commonlawhouse.in/userfiles/file/9899839956.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/81113942737.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/60797094796.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ja2v9tohk8mog27fusldeh9063/newexulevigimol.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210908081748.pdfIn PDF document text
    • http://zussobrance.sk/grafika/dokumenty/56955330610.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/95908305947.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/56834061600.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/poparitufikutumaridek.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/59374706436.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/m46s6gue7fre4l62avr2rgk4uq/mamulikilasiwage.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/jojerunoloxuze.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142feb220d35---50717681803.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/d5cdbc22e8e3a02919a65662f56a6a5c/77364933466.pdfIn PDF document text
    • http://nfc.soo.jp/file/66196486906.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/mibop.pdfIn PDF document text
    • https://austarpharma.austarchina.com/upload/files/giwimozoze.pdfIn PDF document text
    • http://retailcop.ca/files/94731687627.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/xorerotoza.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/89608717293.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/79836931998.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/59569969103.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/60024843067.pdfIn PDF document text
    • 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_off0000b1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 17252 bytes
SHA-256: 875cb51f51fefba2024dc3dc32ccc62e41ef4bdbceabbe554d73bd304fd12f49
font_01_sfnt_off0000de59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE59 10812 bytes
SHA-256: 624ed30accacedd435eb272550fb057327f960f32751f6c4e04025295746ac8a
font_02_sfnt_off0000f765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF765 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1