Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27f11479a9aa329…

MALICIOUS

PDF

88.4 KB Created: 2021-06-26 16:38:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 99b2eeaacd09d6cfd8f75d64b8d77871 SHA-1: 041469b561a748c3f93c5523fb28605e0270d283 SHA-256: f27f11479a9aa329761e3925b3016c0231d11188916febcd40e2cddbbb155df1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially malicious sites. The PDF structure and content suggest an attempt to disguise malicious links within a seemingly innocuous document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160adb7c19b72f---lasekamonabumo.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/bineg.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2feee02a5a---rubid.pdfIn PDF document text
    • http://ashioke.com/images/library/File/72517297318.pdfIn PDF document text
    • http://armanetti.com/images/83013787528.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/dijodil.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/nujirurivinisavapuv.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/3890ce263a523a6e5028be9361c42e19/43790206153.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/zabuvosukitubolepexegu.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d525fdf763---57221113366.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160937e175d384---ragusesezibezis.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c0c07b87a82671435961fc883ea444a6/misewen.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/xipopiziforelodes.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823c6b95ff2---66859939405.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c54e6c08464fc5eff14817bc5af3e684/vekubizodutirubadi.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b31c2b1af91---titizerawa.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/78198664009.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607235037d32d---69586842449.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817ea0666cb---nagibusezotemafisobevutuf.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/rojurokuzogobidi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1451cc2b1---26387779901.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160afe4c1a560f---bamobitugaj.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/jujef.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/tumufefamitunigobitububex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=why+is+pdf+larger+than+pptPDF 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_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 17380 bytes
SHA-256: 5e68367f4b163480f5df48b2aecfb786aef232f5517c43334f4844484488ff2e
font_02_sfnt_off00013be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE3 10764 bytes
SHA-256: d0bf91c1cbe27c4c1f8a03a8a14d61670752dd73b0736964c998c075d646db9b

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