Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71b360fabb9478a…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 20:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16767be6566f130ee2fb922aef2966b8 SHA-1: 1e5625bf57a93096c23d643c0789e5475f90bedf SHA-256: d71b360fabb9478a9b85a4bfd4709ab3d6ac93a83aa2705d97e519fa0571f365
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing 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 distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://synerhu.ru/uplcv?utm_term=science+for+second+graders+worksheets PDF link annotation
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160786b086df5b---85253179124.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210519152232_5vufv0.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/94c0fd33c7334627385aac355ff0be65/61275940313.pdfIn PDF document text
    • http://dejede.com/userfiles/file/popenegoburok.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/138db5a514d4338495b4fd10754ff318/webededitabenite.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bea96f84f9c7e8399430a897f842d556/sazaboxirivilifuxed.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/59152919283.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c850ab600c9---gopefalumipif.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/demudetu.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/16432225054.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/18033803299.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/18652314531.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/46eb9698ca891cc4beee753d3d36d577/80397707577.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/59108050431.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611cbde888993---xowenakutopon.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/68677408177.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c548025ce3e---pozimogin.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/1995884373.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210809_82CC80AA1DA70C82.pdfIn PDF document text
    • http://goref.ru/files/file/xinoxa.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/wuxaseribiledudenani.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f1b1ea300---dafafunojejeg.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/sujibutuva.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_off0000d96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96A 10964 bytes
SHA-256: f2c19bbc3588104919d746a24fab87419d333b20776a9b9400367d1acd54835e
font_01_sfnt_off0000f2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AC 18152 bytes
SHA-256: 2f8ba4829b304dcee336507595898b476dcaedd0057ad6fd255d11ab97ce5c95
font_02_sfnt_off00012161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12161 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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