Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a22d88cc6cab821…

MALICIOUS

PDF

87.2 KB Created: 2021-09-01 17:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 92696b05fe2bbab4d16b6db4d9edbc74 SHA-1: d0e6b1b411d9df0fe31b9a4df8858bea5a342d92 SHA-256: 8a22d88cc6cab8216fc1b3c9aa5f544e4379f2d94218f975289a512c95692bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or scam campaign aimed at redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ij3oip4fabftjn3do74t7jvob1/tonivi.pdf In PDF document text
    • http://kaies.cn/upfiles/210819220722366345gk643o.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/lpo9ji9ad73nnual36c0hc8p47/25549329818.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/da422j3a5qdmocsgb87eka98uq/53683148274.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/jilusarev.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbac37df08---63854154355.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/zebevefifisemiguru.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/vilef.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16115a6006980b---50815923800.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/hvfhmvclkoifmgiqnvolgr01r0/vulutumi.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7e24156362ea585e6b0ae3993af62814/sanatosuritedoritonekog.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/xoxulow.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/97b709f4c7ff5e8811bdf98d4838e280/meranorumelunedeforut.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/27348009131.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/nanab.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/re7oat0doi5fo2l0os5o7pui6e/31137492037.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dudak.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/42588144689.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8ddc52e9---66139585327.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f882a08b---78645826666.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/3jelkdb3rsnofjp95dp9fqbjui/molatuxolusodalax.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a4a936612d3fdd9d61c73879dd904976/7765594718.pdfIn PDF document text
    • https://actor-conseil.com/files/file/nedozevosowisuge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=my+left+eye+is+droopyPDF 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_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 18552 bytes
SHA-256: 610ffe3372b6bf3eedfbed214f19662406045ec59060d970dcea4eefca4796a4
font_01_sfnt_off00011fb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB3 10332 bytes
SHA-256: 7e7cdf5ceb5c119455231f035d866f04cc8de3879476e4305caaf126213e4bdd
font_02_sfnt_off0001372a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1372A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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