Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3f4bebfaa95887c…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 07:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7954642796d34e14eec3ad4178e616ba SHA-1: 80ffd2386c620a2018cb855d3068376343742299 SHA-256: e3f4bebfaa95887c7762f1ff35454c7a6e6e719e54b8536cfbcec8ce5ea5a419
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages. No scripts were extracted, and the document body was unreadable, but the link farm heuristic is sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://marasintl.com/public/ckfinderuploads/files/gudonaju.pdf In PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/96607224149.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/xusulasun.pdfIn PDF document text
    • http://sodrex.pl/userfiles/file/semanuminojegivimiwi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/3130884040.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13223594688.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/41fe715e839424307a0f50f624811e4c/75356784517.pdfIn PDF document text
    • http://balone.net/_upload/file///sokevefutadalejome.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/ci63jml290kinvlgqne6354kie/87494884922.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d899793ce9---zusezutaxisevoge.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xexezixarone.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/debodurofomub.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/70371108249.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d9d526624---77595177415.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/besebagiwemisubo.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a094d9d9f6---49913837402.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210606112139.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/10819723939.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/4e90d15e3bbdff1a424b1a309ba0a45f/zijevarudumisinimigi.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/neweziwotegagowefajibimum.pdfIn PDF document text
    • http://foodsafebox.com/ckfinder/userfiles/files/musukanupebeb.pdfIn PDF document text
    • http://sireny.net/share/files/48365016850.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=uv+1600pc+spectrophotometer+manualPDF 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_off0000e1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C0 11064 bytes
SHA-256: 751dcb699cf9dccc7b13321abb35bf1b30a78a6c58f7fd0e054d1d34609a0ad3
font_01_sfnt_off0000fb6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001137c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137C 18412 bytes
SHA-256: 7d8c3f1d01d7739b63c823d9f0f0261d742f7b0d39d307d93157689113d4fda1

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