Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb404d279fbcf59a…

MALICIOUS

PDF

68.6 KB Created: 2021-10-01 05:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8c010e7d6a1bdb22e03dd3bdd89c683f SHA-1: a0ce48c8f98e05b3034eaa8f0c81133193455ddd SHA-256: fb404d279fbcf59a6556d97e0d156e8daf632feff6784734c5c81c392f11f8a6
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external resources, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://administratieindex.nl/images/uploads/nelojenesod.pdf In PDF document text
    • https://csp-pub.com/stockages/files/volofiboxizam.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/08b3c5d57ca9129874a18ac153d50c32/zawugojejawepan.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/66518556873.pdfIn PDF document text
    • https://globalybm.com/ckfinder/userfiles/files/1631330195.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/30187311326.pdfIn PDF document text
    • https://demo.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/luvazobetek.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161566914a273a---terot.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/vubadewag.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15368582571.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/1ce901296d7ecaaf3365bc372deb9ec5/wuzimer.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/xejubusojusevojeko.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/48254948144.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/dovaloxupagedepome.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/15468634706.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/zevixazegufalugabu.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210921004917.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16142b0157d1a1---tikusegufilozasedilabevib.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/11781970583.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/96380501594.pdfIn PDF document text
    • http://www.photonics-science.com/ckfinder/userfiles/files/90234189734.pdfIn PDF document text
    • http://one9five.com/userfiles/files/masakumibimugos.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/xonubuvu.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151481d0ecfc---35546014584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=cs+go+download+android+apkPDF 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7BF 14916 bytes
SHA-256: ee2037a1d91aea59c94b03639c10af25bf479c089214236384c67cb0bfbfb14c
font_02_sfnt_off0000ed05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 10544 bytes
SHA-256: 6535a11a718f082694b9ec07894c41799d004a9632576ffe7a799eceef253944

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