Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a155cee38be7cc…

MALICIOUS

PDF

80.8 KB Created: 2021-10-09 01:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 70e6a8ae2fbabaaf2598adc683645ccf SHA-1: 0deeb63bea6a76f8fdfaeb0a6a35faf08691c7ce SHA-256: f8a155cee38be7cc10e7a98ddbcd8bdb53cf8734864b4568a56df610ec1e109d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or link farms on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://scsytech.com/upload/files/94969230567.pdf In PDF document text
    • http://marleenjansen.nl/images/uploadfiles/vetukusixamogi.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/357a8765466acd4d133ff7cf660cce03/97341144185.pdfIn PDF document text
    • http://citra.cl/userfiles/file/lalupomugesizidirubo.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/bujikobamaforiwibabino.pdfIn PDF document text
    • http://esipro.be/userfiles/file/2999290316.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/luninowudigilap.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/lisepogasumesizapefarivaz.pdfIn PDF document text
    • https://laser123.com/geektic/files/sewabitugijagifu.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/67051551584.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/7725822734.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615c900178db9---16171383632.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614dcf6961d60---zefomesopamejigu.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/noweruk.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/36878712418.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/r92tssjrk7igit2351h8t1qq8a/xisofukedudewod.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/230524271902.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/tozoriwefigonogikezezes.pdfIn PDF document text
    • http://tchid.net/userfiles/file/15625327823.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/33369801867.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/36668053573.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309e14a3e6f---pitaxoluxibavupatiburu.pdfIn PDF document text
    • https://soudurelausiere.com/upload/editor/file/20966933330.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/lilejumuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=crossword+clue+for+argumentPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 19088 bytes
SHA-256: 849a6d9d1af06a11fbc4017f38dfd7627a9c091b51a25e7e1a0372067fba7662
font_01_sfnt_off00010488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9F 10944 bytes
SHA-256: 541f24299f4c6a53f959a927274e8b423329e69a34fb4b7da77bfeca8fabec2c

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