Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a2fd398d03ecbcb…

MALICIOUS

PDF

80.4 KB Created: 2021-10-15 02:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8f643a192b1b546f245415869c6e1993 SHA-1: 36124ea56391380fb4ac9f323b21c8dae15a2d96 SHA-256: 1a2fd398d03ecbcbb96c574b623254b55cd8d493f034e263eb1e2ccad22e99d2
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms on compromised CMS uploads points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alisawedding.com/upload/users/files/20901091481.pdf In PDF document text
    • https://sproname.com/files/userfiles/files/18047253901.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16164d2b3812ed---sudefokozisexane.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20211007_110509.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/86784703251.pdfIn PDF document text
    • https://upbfassadenbau.com/upload/file/mogapilevopabukenuge.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/70986690396.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161539649064a5---xagerexigonenobodadi.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/39070128454.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/zobejoraxigokaki.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/ximibeguzuburukemabadez.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/17229400dfa474a7fad47fe7f7a87cd3/somobugewawafora.pdfIn PDF document text
    • https://mgrenginiai.lt/ckfinder/userfiles/files/9058586759.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/70094208446.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/75773124631.pdfIn PDF document text
    • https://jamurgoreng.net/contents/files/tomatesomemusamazu.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/58798590028.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/92085171905.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/zakuwinatozaj.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/56669458001.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210911032535_3wpzpg.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/pinomumakosobo.pdfIn PDF document text
    • http://kalikraft.com/images/file/lakup.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/jewexavopetaxunodaj.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/26725159935.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/7xhmvLXWVJc/uplcv?utm_term=intussusception+of+appendixPDF 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_off0000d749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 10620 bytes
SHA-256: e6b70b37a4a980284931aeb953912a77782dc15be95cdfd0ef5077e52c1d4024
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CD 16944 bytes
SHA-256: ab63cb2f2a28ef8ee7de1fbe11aa315771b09dfd85425c99cc04035ddf47695f