Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dda919d7c33643f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-21 05:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c59813110be2d7bef46adfe32ddc145 SHA-1: f11f0eb35f3a9081781c7c6ea6a613f3e04bb885 SHA-256: 5dda919d7c33643f53db04b6b0a3461b24d05867c4dd96201da7037b1707bf9c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics point to the document being a link farm hosted on compromised CMS uploads and disposable hosting, likely intended to redirect users to malicious sites. The presence of a QR code lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/pve8vvl25gkumn93f7g2iujl05/58981134966.pdf
    • https://haruhonpo.com/upload/haruhonpo/files/zenis.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/26854890306.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/4b90c1d51be37c48d85aabf56f10938d/77578014853.pdf
    • http://vinhthuan.vn/upload/files/dovamojimikot.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/c0c86276e210c84e6ef190d5eb4d0394/93579751138.pdf
    • https://vili-al.com/uploads/wysiwyg/files/gelokagetarabarenilugu.pdf
    • http://studiodebiaggi.eu/userfiles/files/1684257349.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d42792da4---sasujinunese.pdf
    • http://abwingstop.com/uploads/files/paxofivuwejegixefatir.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454981c0dc7---rivajer.pdf
    • https://ever-progress.dacola.com/upload/files/kexizovetamexafisuribox.pdf
    • http://baltyk.recykling-rejs.pl/imgturysta/files/diluj.pdf
    • http://amy-tsai.com/images_express/userfiles/files/pijixorifarakujixojopak.pdf
    • http://pk.mo/userfiles/file/43522289252.pdf
    • https://regaluxiluminacion.com/uploads/assets/file/kuboxezenafafuxuteza.pdf
    • https://parkettworld.com/upload/files/vosuzonojezivomakanog.pdf
    • http://italy-ex.com/images/blog/file/29427006077.pdf
    • http://vkts.se/userfiles/file/geseminokadanivik.pdf
    • http://location-appartement-venise.com/italie_documents/files/18851411495.pdf
    • http://gabident.pl/local/userfiles/file/sisidenezarilapisabav.pdf
    • http://stickerbarcode.com/file_media/file_image/file/17303134155.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+scan+qr+code+using+iphone+7+plus
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d48c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 16792 bytes
font_01_sfnt_off0000ec9e.bin
bbe8d919f4cd8e6e2605bbeea9db423dc1ef29677eb643568f3eb20b961680fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 18064 bytes
font_02_sfnt_off00011b4d.bin
7cd5e2205dfe83192c8be864285d0d0a3ddd0b1b94e41fc12c4b1ba9024488dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 11164 bytes