Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa7bdea348275cd…

MALICIOUS

PDF

69.6 KB Created: 2021-09-26 22:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 823a3f26f774a93fb9a3c12b00c637b2 SHA-1: e0732cb4a2a12242a254c9af1ea6aa9065512c93 SHA-256: 3aa7bdea348275cd84fd93648bb8cd43b92f81c4fc81c6fdfed8831352a3df7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to distribute links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=how+to+download+taptap+apk PDF link annotation
    • https://easy2ticket.com/upload/files/29385219067.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/bamogiremililixixisam.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/39406133706.pdfIn PDF document text
    • http://roocenter.ru/upload/file/81535279966.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/161391f1e294f0---jebevogeno.pdfIn PDF document text
    • http://js-space.de/userfiles/file/jujabezubasuxumogixedebid.pdfIn PDF document text
    • https://iword.de/userfiles/file/47508091438.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16141e82235709---riluju.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161421dc415838---sisibifizatizaziforabi.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/konekedirili.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/pewexovawejodukonawo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/tepomewogusaxafikopiwale.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210904124447.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/3tf9nh2qk067mhq9jr8p6qfl55/wivavizizovupapoxigaru.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/24724430881.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/24223473160.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/witolumux.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/penuwejuxudigekudopu.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/legafumajaxobigipuwo.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wuvixiparok.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/zabapufivazegefisinilumu.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/nerumoze.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/losemiwelomuxite.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/metekuvegepozu.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/gekepijupawekifuxopufav.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_off0000b365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7C 10064 bytes
SHA-256: 526d4b41e9849ceae9d6f380b64d3ff039d11587fec15294068fca81ed96a4e1
font_02_sfnt_off0000e1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F8 14732 bytes
SHA-256: bb81f63d6072e457ac5481fcf38b4923c10b83a9c6e7c2ec9bb52a2018dcd62a

Open this report in the interactive analyzer, or submit your own file for analysis.