Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ed17904c96f6ce…

MALICIOUS

PDF

81.0 KB Created: 2021-09-16 05:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 557a57dea81303f5884282eee14ad724 SHA-1: b6f57cad78691e8bb84043e1e5975d56944ae126 SHA-256: 23ed17904c96f6cefaf15d11525e6c9808ece3b2f5a4bfeff7939d50903b003c
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests a potential callback phishing or tech-support scam pretext, although the document body itself is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://hanart21.com/files/userfiles/file/vemupedaligatopepa.pdf In PDF document text
    • http://lemma-studio.pl/userfiles/file/87548228360.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/36266337866.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/94154276763.pdfIn PDF document text
    • http://gonzagafood.com/userfiles/files/pitorewid.pdfIn PDF document text
    • http://spbi.cz/res/file/wuresajanirujigijuku.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/46593924857.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/82201836179.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/76753023216.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/zowafilekimekapik.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/e4ad44df22d4a46db19010a1c81542f5/64223697493.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/97050490122.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/5240278263.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ljbvv3bpcid0vseeong2mhhsm6/88583042545.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/24943815740.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614173a7359e3---pivibaketod.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/73323875701.pdfIn PDF document text
    • http://zgic.ru/!upload/files/33913398280.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/nipafozedokitovopukefoka.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210902170138.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/736739239.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/zukarudajafolilolizoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=st+francis+xavier+massPDF 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_off0000d1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AB 10572 bytes
SHA-256: b84464a4ddd2f9715acfb1b19217e91a634a8238f1074b67120a3b091a7b28ae
font_01_sfnt_off0000e9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 20160 bytes
SHA-256: ff38547c3c08ac6140b164b32b296ae526e048e298b502bff732b5e7ccadcc42

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