Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ba4fc5df90e84f…

MALICIOUS

PDF

75.4 KB Created: 2021-09-19 08:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a01d4e91d0e75a08c752f3cd4c379c1e SHA-1: 3baf802e09bad0e257ddfa9ca248885ad1d7f323 SHA-256: 58ba4fc5df90e84f20157e0912b4d0b9d5931494349d92a91cf75dad2ce475b0
164 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs hosted on various domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ayurveda-shiatsu-qigong-nice.com/upload/files/tewesobasij.pdf In PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ada158a34b---41038472737.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/56752683476.pdfIn PDF document text
    • http://beta-rc.com/upload/files/37765248317.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210919051033.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17255981314.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/52567b853777ce78b04ab5ee2bed230d/gigawelubavazekixoseru.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/87cdfced3c5df119adf6ede1f148c0b8/xikavisukojovixaxakuseto.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/gefosejasoxokawi.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/44035604301.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/bevumu.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/fopevefenogubuwoxejorama.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/8lts8o37904i3ou64a262f711t/64742825960.pdfIn PDF document text
    • http://garderoba.sk/images/_file/wodamuxamajo.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/96824164977.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904005403.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/pakasefiv.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/vonorun.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/53516628141.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/7719178828.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/31571155649.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db2f5a2a9---togiruxibinavarujid.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/49783209390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+mobile+torrent+magnetPDF 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_off0000c2b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 17576 bytes
SHA-256: 51e4148c0f9ee88c0389200d9272f2bbc7c11c256255d693826cbe44e8f4f628
font_02_sfnt_off0001088f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088F 10464 bytes
SHA-256: 31a69e691b2136e2a0259a44d45bf7d1971a541985d713c068164994b9390714