Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e87ed49e1bdb411…

MALICIOUS

PDF

82.8 KB Created: 2021-09-05 05:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7035690c4d7337ef5de45ab86960791f SHA-1: f5271120080a6dff551a109a20f6bbcefdbef249 SHA-256: 3e87ed49e1bdb41114b35c98f944434841717acb5f1f2f6985c44236f7430214
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kasintorn.com/images/upload/files/39955899603.pdf In PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/vununenoduguranapibiku.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/29268471347.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/38825548254.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/dixixagafajebo.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/mekigorozubufobedo.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/wuzukewuxawajotok.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/76492985761.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754d0e1b9ea---fotud.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/43786162352.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160844b6cc4c9d---14157611245.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/c5076j9qa5l4jgmnnnmk4kes93/33252012564.pdfIn PDF document text
    • http://hrudolf.com/userfiles/bebodoperilus.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kff8ar3osgc4l8kihktcpjjg46/wapesobubetovuwuzasite.pdfIn PDF document text
    • http://tieclangman.com/Images_upload/files/64929381563.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607439fe3b1b2---84282541196.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/xozera.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/59349308813.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/nivududenolowekelez.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/79e3fcde76d70b113a823fd34add820e/3822123310.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e6a53d30f26b16e657c89f56aaad546d/lubivibokunox.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094760e8b083---murowebezisemove.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/5cd27dbb5d8a373d9426fd772c81e43f/vetotuleniviret.pdfIn PDF document text
    • http://moneymaker-gold.de/files/tabujiwolizafavip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=toolbox+talk+sheets+pdfPDF 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_off0000e15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 10596 bytes
SHA-256: 0352f60f7cb58e54e1952469136e922337830d33f5a66117e3442d244b9ea708
font_01_sfnt_off0000f991.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF991 17060 bytes
SHA-256: 567a57fa5a4535988170edfb1dc16e0ffb403a5006d48ea2e42e8d94840cd724
font_02_sfnt_off0001259a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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