Malicious PDF — malware analysis report

Static analysis result for SHA-256 607bf2cf25523417…

MALICIOUS

PDF

74.3 KB Created: 2021-06-26 20:33:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a17793c3543d627ab5b950407cccb37 SHA-1: f35d3a27eda462b30884b96d3c4b4038a8f747aa SHA-256: 607bf2cf25523417e383340b01872f7ea4d522988bc8eccf19e1c3ec050a2cd5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://usaoxin.com/userfiles/2021-5/file/36916371317.pdf
    • https://vestol.bg/files/file/84280957390.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1c3bdee50---35279474118.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/51pdk89uh1e9rdipbkniiuvgm6/vifotuzudinozibi.pdf
    • https://daiichigroup.net/uploads/news_file/6897734658.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3qe7uokv227olhc0chtcjef32p/42009919724.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083add32f15e---70230804377.pdf
    • https://wodepcb.cn/uploadfiles/files/tafoke.pdf
    • http://urjabatteries.in/userfiles/file/fadixadosufamegimafurig.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/kowuxifojezitokani.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a35c64bc3ed---89942333463.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16094c41e0b9cd---fipaxevaw.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/b227a34cd38d082ae38b8f2b8e97b78d/sozofanurapakison.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/085d74a2820336b01c835d8a60005af3/82077338178.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a256503195---gufusexup.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ejoor71c016dpilqhqsubb0tlc/dimaje.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/05879e4ecabfd518ee27d918f75521d0/wodoxalol.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb4600e8c0---434622773.pdf
    • http://caopump.com/admin/userfiles/file/fusaxaxudoriro.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/ff5c4eaf0ffc498bea06d6c4be39f077/kemafonofalubuvazuteret.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ac90e8a9---88574823003.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc39793c373---13804669101.pdf
    • http://primaneighbors.com/userimages/rofufutanigepezo.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/netakakuwod.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=and+we+exclaim+our+god+is+mighty
    • 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_off0000bdf2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF2 16792 bytes
font_01_sfnt_off0000d604.bin
c0e8d5ad1d82e70e446dc9acf0d057929c0b786b6e6cb7932e7701eb39508183
pdf-font-stream PDF embedded font (sfnt) at offset 0xD604 16744 bytes
font_02_sfnt_off000101ed.bin
4b1c303988dcef5b787fe058527dfb3c2ada9e141b2f66dbc1a1b4be3d7e9597
pdf-font-stream PDF embedded font (sfnt) at offset 0x101ED 11200 bytes