Malicious PDF — malware analysis report

Static analysis result for SHA-256 edbd8ca759f487eb…

MALICIOUS

PDF

84.4 KB Created: 2021-08-16 14:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 321e3d76f7940ccebe1f2c392179edb4 SHA-1: 7ff0e053af44ce134e5cefcdd40a4e4b37d6eab1 SHA-256: edbd8ca759f487eb0cf5149965a9f2e6cde57efa6986f9dada70d7789d97ebd6
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure align with common techniques for delivering malicious payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sosnovgeo.ru/userfiles/file/zofemuxoluvujozejebaso.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/41kfprgdbq3h6vkmidr0l99k68/8164938657.pdf
    • https://geneolock.com/locktactyuma/userfiles/file/woleritudejowisuzix.pdf
    • http://cathyknightwaite.com/ckfinder/userfiles/files/kagemobabifatuwasiz.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/sanusokimaxepekagume.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/63369eebad51a1f604ac3935c0750ce2/joxas.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/mofotutuguzajas.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/96145c763e694fe18f4633166e4252fc/gogoraluduxamokemobemab.pdf
    • https://hssanesteban.cl/files/litoroloxozurogopevoj.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/bulomotavupomiguxibowo.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35295d85f0---pijodofilutafabo.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/k73o1rd3m2t3keq6abdtndvfrd/19386407575.pdf
    • https://webshopplus.nl/app/webroot/files/userfiles/files/14592121274.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6e173e4ae---wejovep.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffd48f4175---21674570564.pdf
    • http://spreewaldatelier.de/img/editor/file/50629077792.pdf
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5d4f2f2fe---molop.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/315f346de21c3960f38ab9208d7bca32/vorawarapobifadul.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8gr14ek5lar5kpmd8963acjgv3/gajida.pdf
    • https://namhunglogistic.vn/site/files/95812256218.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45ba3a8943---xeferaviwonufowoxigez.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/aqng7t8t8t1r2p0g99561f1qp3/sederusinatuperelimozotat.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/92ac4f4f4be5f463430f6133741ee6d6/mokajajapi.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q8gbq23heamrosiu72a8a2sn12/wemufin.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+trade+bitcoin+cryptocurrency+for+beginners
    • 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_off0000e412.bin
23dbf03c5b42eeeeac2553e9de6cebc39d6aed9c2ca51cecb99c705ff8e066c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE412 17528 bytes
font_01_sfnt_off00011212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11212 16792 bytes
font_02_sfnt_off00012a29.bin
9b11d0ddfd40d4b18b0b66a53fc1abb5004c7247fab6082134e6b29b91c653da
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A29 11180 bytes