Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53bf1436ccbaa35…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 22:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2eb203409c9a5957c3a823ac28ba17b2 SHA-1: 20732fd487539534867cf035023a5e937139eef3 SHA-256: d53bf1436ccbaa35b2370e7614827067ed4fa3e6bb89d7e382f99728a28ba7ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous URLs pointing to PDFs hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF itself appears to be a lure, with the primary malicious activity originating from the linked external PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c8d79ca7eac2648e4e8a62bee263b98b/pugelavalowojonafefa.pdf In PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/3asfri3pqkvtcag5jgpucistc4/ranubosideripidogopevejox.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27df93cc9566be13f883b5c7d4fd7dde/87263537732.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e20cfae8b1---91008454735.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12946269007.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/vosiwixupi.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/29775632156.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/fagunukufufudutevojop.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/kezezitidudusawuzanitam.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/sewidavidamepef.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16075afed54443---89820561645.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/71563771054.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/doxasopoxududonopifinab.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/94708497752.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/zoronazulokubadasajapuse.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6aba408b26---guwobamegegejer.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e6677bdfc13---44113254798.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/23776828259.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/48112386968.pdfIn PDF document text
    • http://stevis.cz/files/file/27479719180.pdfIn PDF document text
    • http://hindel-relax.ch/ckfinder/userfiles/files/zofuguxazipil.pdfIn PDF document text
    • http://leton.pl/userfiles/file/10173457562.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021061720294073499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bissell+proheat+clearview+rug+cleaner+manualPDF 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_off0000b3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 17708 bytes
SHA-256: 281a61e1b86b418e340d3601f6491122b444f2d293312b5fc91a1cb13a41d917
font_01_sfnt_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF786 11128 bytes
SHA-256: e669b9426e17758f13322733f6290c5fe02c4d83767429d15b9323e6ef82e8f4

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