Malicious PDF — malware analysis report

Static analysis result for SHA-256 da74b58b62d27520…

MALICIOUS

PDF

87.8 KB Created: 2021-08-25 10:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04c5795763974ff8c56002cd8333869b SHA-1: 44a54caf020270150d3e0d1278ffefe70e3df181 SHA-256: da74b58b62d27520c10bd2d992640242f9e4a5353f85a8550ba661260490b2c2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The primary attack pattern involves directing users to external, potentially harmful, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xn--l3cbpp3gh4a5g5c.com/userfiles/files/wufofebavajevux.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b3b1ece17---sofikir.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/ee68eb0854adb55ce63eb0e6be5b427e/tigilunividumenekurewe.pdf
    • http://inwallendorf.de/userfiles/file/bitimagunuk.pdf
    • http://linkingpeople.info/userfiles/file/kakafobiliwizuninig.pdf
    • http://kpotplace.com/uploads/files/pozudigifavi.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/4df28afdd59731799fd7a25abe849aa0/kaxaxusujowizodole.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5ab7c6962---23261955139.pdf
    • https://fruitssupplier.com/app/webroot/img/files/rofopebe.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/wukiposefa.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f65936b5f9d---75438751691.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb5e529b58---runazama.pdf
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wasunivisogerore.pdf
    • http://asbu.net/uploads/FCK_files/file/59639674418.pdf
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/bomirexipefupinutafovire.pdf
    • http://www.gonouvellezelande.com/files/dipupojatebelivavo.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/89185954175.pdf
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/jewiguvute.pdf
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7378db3fe---zofevu.pdf
    • http://www.vikingmaterials.com/img/zawurinixotajutujud.pdf
    • https://cmfnepal.org/userfiles/files/topumetal.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gated+rs+latch
    • 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_off0000f489.bin
9d4091139b319b129c042eb5f7a728683a0c8e2a7bedde985a8fbc83ec1361f4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF489 10192 bytes
font_01_sfnt_off00010b83.bin
885d456a4e3f9ae78cea7dff7a076423c19fbabcdc024541156b421c78fa4c72
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 17252 bytes
font_02_sfnt_off000138d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x138D5 16792 bytes