Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd40af1eeaab49df…

MALICIOUS

PDF

78.7 KB Created: 2021-09-05 04:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b0d772b248819ac26401aea813b7e7ac SHA-1: d06236702db65f87714452cea8c43cd1f6ed4cbb SHA-256: dd40af1eeaab49df2c74178054e99ffaeb4faa32fd8295881512829de9bc52d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, a common tactic for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports the phishing and malware distribution vector. No scripts were extracted, but the overall structure suggests a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://salkim.com/userfiles/file/97647753107.pdf In PDF document text
    • https://abe-rdc.com/userfiles/file/49496211561.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/7411591136.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/bebosaxabesesofefix.pdfIn PDF document text
    • https://rajaunited.com/contents//files/silapotuwufapepuvuzag.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/11371568247.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0afb55e3---vobofefimaliramexawa.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/jixinitoxuwemo.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/15876106746.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f6555b39232b4b478b9119b20c256dc1/moforuxadodekurivaji.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/18747597272.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/xobanew.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608098827338e---rolafavamoretezibabe.pdfIn PDF document text
    • http://land89.com/ckupload/files/69081585832.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210527224713.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/pogukesuzupekepuwunos.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/k47jp4umr9qvpd7hkn33ge6f2d/64268792618.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/86731421116.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/87535259316.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607163675fbfa---gerorimofexoda.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aba828ccb3f---pisoju.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b17f2d2237---63864215937.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pixel+art+color+by+number+worksheetPDF 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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 17176 bytes
SHA-256: cd3c5c8a2f038f19673265cd2378ad73735067857cd539be7725a3e8050b151b
font_01_sfnt_off0000faff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFF 11128 bytes
SHA-256: 449acc398978bcb179c32b6d66ed1cab29af33b3aae4372a2117d94a5f6a948f
font_02_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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