Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a0345771f645ec…

MALICIOUS

PDF

89.2 KB Created: 2021-08-12 09:15:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1d0d202813673fadb3fa8048f0fb159d SHA-1: 9e1469cf36fe110699e9df382084589633886c36 SHA-256: 04a0345771f645ec396f3a12fe3adf3a65b3b0f212a2d0c5fb35713b51d0ef5c
184 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to compromised websites, many of which host other PDF files. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730b9ecd4bf---butorupokivan.pdf In PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/losasotugokipitaxoliwuw.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f15c1cabed---fakimosudotokij.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/76148395692.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074368f16553---vekunepugelokejiponaja.pdfIn PDF document text
    • http://darec.sk/files/files/1169350600.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160a79273b5974---31611610135.pdfPDF link annotation
    • http://al-farh-iq.com/upload/userfiles/file/5355332083.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/49964519357.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093d0c3b4879---biwigurojerevapetu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d7abda50c---92798796660.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/77243546722.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/c3abc0cfdd28e530aac2fa9586f97ece/kisalirinewuxexotam.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/0g9lp7mj5jgev051uh7h9saf61/90676866531.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/dipidi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/9d5qml8opps8eksdn0h8o7av81/jabogitovano.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/83724743050.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/82256579349.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950eba073da---vidada.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/a8693f8bf5b179d04492039b58bf790c/34440033831.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/25934077294.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/2712ecb30a5aedbfe6489746dac55a31/biguropu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/xexetopidamitarid.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-30/20210430204643932786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=serial+para+easeus+data+recovery+wizard+11.8.0PDF 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_off0000f5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BB 11352 bytes
SHA-256: da3f8eb2ec610304f8a78fb397bff2a4614746ab659667de75510aa74ea3d0f5
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 17264 bytes
SHA-256: 719aaef96139759bdde3725ba8d01c664accd02b1db9208259ed15864b24d26f
font_02_sfnt_off00013dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1