Malicious PDF — malware analysis report

Static analysis result for SHA-256 afbbb7beffacf91e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-20 01:03:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78c4aaa84754faa3c089d53064df03ae SHA-1: 2c0afa19c6ba60fce8caf9d27ed5b6dd50cd87cc SHA-256: afbbb7beffacf91ef5be16c9904bb78571dcd99b2d1a92ea6ae08351b4062403
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.kymenhome-etsinta.net/tiedostot/files/76185895111.pdf
    • http://darec.sk/files/files/kedokevumobuxofov.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144914df2775---jagemu.pdf
    • http://kavtas.com/images_upload/files/taveruniberupafoge.pdf
    • https://dcicz.org/userfiles/file/gazorajifojiminuxalaweges.pdf
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/63773129843.pdf
    • http://npk-bypassdrr2.com/file_media/file_image/file/wetifarivetumejij.pdf
    • https://stauber.lt/images/files/sutexiwuk.pdf
    • https://nergizleryapi.com/image/files/366259228.pdf
    • http://genarchi.com/data/temp/file/73942394872.pdf
    • https://winstar-tools.com/UserFiles/editor/file/55470814648.pdf
    • http://healingtown.org/userData/board/file/54654666825.pdf
    • https://chezgregoire.fr/userfiles/bojodatazisotatipi.pdf
    • http://shengnabei.com/uploadfile/file///2021091417114569.pdf
    • http://wieswioska.pl/userfiles/file/tufakedokudatimo.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/tiwujenafim.pdf
    • https://nmcs.ca/userfiles/files/23423285360.pdf
    • http://pc75.net/upfiles/file/1631813544.pdf
    • https://asiapharma.la/files/files/9765168333.pdf
    • http://phuongdonggolf.vn/app/webroot/uploads/files/dizavosadoxifazab.pdf
    • https://indiansabroad.uk/userfiles/file/ruwopezekukir.pdf
    • https://asthasupermarket.com/userfiles/file/73107187784.pdf
    • https://semagro-msw.ru/pics/images/file/fovigi.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf11b1955---zesinulobaz.pdf
    • https://izr.fr/files/zafusezizupesat.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161346e513413c---98683398167.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=friends+with+benefits+series+watch+online
    • 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_off0000c187.bin
8427ecf581c38b9eef353630be6ab39dcccbe10fec11a9acf8fcdf75ffa68520
pdf-font-stream PDF embedded font (sfnt) at offset 0xC187 10776 bytes
font_01_sfnt_off0000da43.bin
a62e4433047d61930098fea1bae7f1e776571cce05fc3eeef931e6ea9727b483
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA43 16696 bytes
font_02_sfnt_off00010506.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 16792 bytes