Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaaffd5deff97bb0…

MALICIOUS

PDF

82.9 KB Created: 2021-09-17 15:21:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42ae01b4f805b6e560519b62d5c245a8 SHA-1: 7ec3a195e6e1de33397e7aba4f98bf54d71b21be SHA-256: eaaffd5deff97bb0abd2875a5e19342495adb23728c962fd603afe3ca1f7f14a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised hosting. The heuristic 'SE_CALLBACK_LURE' suggests the document may be designed to trick users into calling a phone number for fraudulent purposes. No scripts were extracted, but the presence of multiple external URIs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 https://synerhu.ru/uplcv?utm_term=chal+mera+putt+2+2021 PDF link annotation
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/4476963201.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/27033147821.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/42413450c502c609ec9a34cc5a04f8e4/34569324129.pdfIn PDF document text
    • https://conviviodihera.it/dati/upload/file/zerilimis.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/gigatusisapoxupaluleke.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/69119426504.pdfIn PDF document text
    • http://gerocuki.hu/user/file/54473410768.pdfIn PDF document text
    • http://njxinbell.com/upload/files/38120377352.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210902000314.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/65098128687.pdfIn PDF document text
    • http://esipro.be/userfiles/file/8168253671.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/neweniro.pdfIn PDF document text
    • https://cargobull.cz/res/file/65410940619.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ae9c296d---92829377486.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109020558494826.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/88132629690.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3341541b1---widakanapiparadizufuduxul.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/94738201161.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/152041517793.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lufevowola.pdfIn PDF document text
    • http://kes.org/upload/editor/files/vusiliwutaferivetosora.pdfIn PDF document text
    • http://contua.org/userfiles/file/fifezanitukuzafagukob.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_off0000dfc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC7 17820 bytes
SHA-256: 996d1d1072e7b7a55357c23232543e2cb859ff60727385c335bfd6566c144a24
font_01_sfnt_off00010e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001268e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1268E 10456 bytes
SHA-256: 3253dc97ec99c69cbca1a2065dcc129a136495debe4ec1a4cfdae3ca78906793

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