Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5eaf31f39e58f1…

MALICIOUS

PDF

74.0 KB Created: 2021-07-04 12:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6cbc4ceb1c9e672f76c7806abe87d6f6 SHA-1: e7d03b85b13444458bd9c487b0432e3dd7061f19 SHA-256: cb5eaf31f39e58f198db4bd9b0399324bd671ebbd5f19f45d26470b43435db3d
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.tobywells.org/media/fckdir/file/wirodumonosofudotejimixuv.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf0fa26b9---suwafupofesoju.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e4a7578786bfc5a1fdd00265c6b5851e/darozodawegigivoxov.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/89135312164.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095363e8f5f1---babarefeso.pdf
    • http://bawaconstructions.com/editorData/file/lusegodolukeguwuvowozuwi.pdf
    • https://raiporjai.com/piceditor/file/58894486606.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a18191477e9---karupomudoxekebozugag.pdf
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/salofori.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a28fcf0388f---61393731154.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1977920c---64252380838.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e465517cb3---13999625252.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/416jfg8tkbbs1vtvjkejadd6o0/56634708079.pdf
    • http://alexdisinfestazioni.com/userfiles/files/17905114610.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607499aaf34ac---28979681711.pdf
    • http://acpiindia.com/userfiles/file/tokodoz.pdf
    • https://digireg.dk/upload/46155965700.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/kjrr9l85eth385oobno3kchn12/viwopofuvovivu.pdf
    • http://project-lovcen.me/userfiles/file/gujevubugo.pdf
    • http://alemotta.com/resources/original/file/45211109596.pdf
    • http://royalgoodviewresort.com/Uploads/file/bumekilokezosoxilo.pdf
    • http://kayapaliinsaat.net/file/vagepevovuzuvajemavozewa.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee51iem3e5pjganld5o39j2lff/10685582804.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+science+and+practice+of+pharmacy+by+remington+pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfeb.bin
773d282eadef87ea6994136a882ff3d02eb7f0743d9baf1c2643b5f70528e5fd
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEB 15744 bytes
font_01_sfnt_off0000e845.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 16792 bytes
font_02_sfnt_off0001005c.bin
ff9751b17133065b58aeddcee651e5abeceff5f522d3d7bb0b205f8554fb8baf
pdf-font-stream PDF embedded font (sfnt) at offset 0x1005C 11240 bytes