Malicious PDF — malware analysis report

Static analysis result for SHA-256 cecfc77bc147af83…

MALICIOUS

PDF

82.0 KB Created: 2021-10-12 05:44:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4fbeba29ab1272bff05d6b76e69a4d55 SHA-1: 5f8e0dffc2d4d877037931b2bc33b578606ce7e4 SHA-256: cecfc77bc147af83403e83e556d43dfa2998f633de7a9524179bbdc48882254f
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggests it functions as a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext, likely aiming to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://garglob.ru/uplcv?utm_term=daily+mail+quick+crossword+answers+yesterday PDF link annotation
    • http://powercleanperu.com/cms_powerclean_2015/sgi_userfiles/userfiles/files/puduke.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/8039828041.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20211008201713475.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/93805568171.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/supideritu.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/lixojibijun.pdfIn PDF document text
    • https://slavicchurchmississauga.com/fck_upload/file/92048595201.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/remasapesesujajovex.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202110100108564183.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/25576425001.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/43058394610.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/81757945830.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/vifefonafibasijetite.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161377f92dcd4b---kegixivifetugijosegakeji.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/bovaw.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/39307434080.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/fazovekelitulekodowolava.pdfIn PDF document text
    • http://refmexgl.com/web/uploads/assets/userfiles/file/99404153805.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb2b5c91b2---lowano.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/88946478754.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/28869621301.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a2275c247f---vigog.pdfIn PDF document text
    • 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_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 11072 bytes
SHA-256: 491a2387940ae5efc0acb2253d254ab335a719aca0d038685dea376f2817baee
font_01_sfnt_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 18640 bytes
SHA-256: 970e25116847ff372c729418a1aecb6c763dae1a0314a7f8a711a9e3a76f66a6

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