Malicious PDF — malware analysis report

Static analysis result for SHA-256 53cf9618875a09f0…

MALICIOUS

PDF

72.8 KB Created: 2021-07-25 03:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 79ebb2663c646aa1142fe58bca7a4265 SHA-1: 91d3365027789bd8f392ed3d84683303d11ded1e SHA-256: 53cf9618875a09f0a279735499262c1d27611b62a4d05f7041aee7d36eb5d967
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external domains, many of which are hosted on disposable or compromised CMS upload storage, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a likely attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://yuanyoujie.vip/userfiles/file/ruredapiboz.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kalijezetizonopomiwexapo.pdf
    • http://deccanquest.com/konadnew/userfiles/file/veduw.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8a25715a204a929ef05b831ea3bf7dea/bokajozoxu.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/95164140503.pdf
    • http://brilspa.ro/userfiles/file///8787716913.pdf
    • http://skupka54.ru/upload/m/roguwulugewelejafo.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/25e915dc6194ee660aa553ddb038c892/17462295901.pdf
    • http://tycoonmedical.com/userfiles/file/zefasu.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4eafb63a2586fa96a3ece0ee6489c89c/ratugike.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1c481520---13895141703.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b34a4bff---74545009897.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a62aafd1cf7---kuzekogagarivetiwe.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/ecff7e799beb2a965d84eef8f44bc597/22444727998.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/q6qqrbqc0qmfqe30ignh8ir4t6/mebadifadowepefegu.pdf
    • https://binarbaid.com/public_html/userfiles/file/wedinebuwujobanalelifebis.pdf
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/8f70c6dc78eb8571ab58c71693a15b5c/zubadulozonejizowot.pdf
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7447d3152b1b80126ce719ede0edc249/pedezaniguboxeruputonikup.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/6rhgr67c0gpsu07om58hgetku4/3457068277.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ae4987eaac8523afca1d5f388fd6e023/87719994986.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/67763527362.pdf
    • https://muratay.nl/userfiles/file/dapibapuwisivis.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=aesculap+container+catalog+pdf
    • 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_off0000bc7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC7A 16792 bytes
font_01_sfnt_off0000d48c.bin
dfb8225a84f4083dcc5b9c8e53cd4b43b0c4b0e77eed14f7ef077b17e3163ab9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 15820 bytes
font_02_sfnt_off0000fbea.bin
a677b6494ae9be5b05c3ca2ba5102b17bea042d41c88c981a55079dd6e89d41d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBEA 10876 bytes