Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8848ea5ae0bdde3…

MALICIOUS

PDF

86.4 KB Created: 2021-07-01 16:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5f8a2226b8d90fd0e1c51a8433b3449 SHA-1: 8aab7139010a1648c49171eac47d844d6a185208 SHA-256: c8848ea5ae0bdde38ba2531bdd45ea38a968bac176000ac028a9b192ce693895
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an effort to obscure the true destination or to leverage SEO for compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/h3hecohpbdpsdl9gmv8aa1e80r/renesubejef.pdf
    • http://planbmedia.hu/files/72313318767.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/1761168387e5beacb360bae4d5fd5ae7/jomususuw.pdf
    • http://pm-property.pl/userfiles/file/juxaxuvovejep.pdf
    • https://uleshuzatabc.hu/files/file/fadaxow.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789acc71de4---86409462438.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9754c95aa---riviziwovu.pdf
    • https://maturana.cl/upload/file/37551254632.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/80623930188.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16090793b32fbc---mujadiwuvafajofapogiw.pdf
    • http://tourister.kr/userfiles/file/fimivavefo.pdf
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b7052c0d3---75835074672.pdf
    • https://rent-1.es/ckfinder/userfiles/files/palategupizederufo.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077484cea44f---29404180551.pdf
    • http://gdwtechnology.com/fckeditor/file/polekireduvulizoge.pdf
    • https://machnhaduong.com/images/uploads/files/96898701571.pdf
    • http://sowa-architekci.pl/userfiles/files/busapadujozinarogi.pdf
    • https://geneticapanama.com/userfiles/file/jubapilevubaxebof.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21df537d1a---98277946136.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da22a585aa---dozuderapubelibipa.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b2d440c04---perowifu.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fd39bbe53---zajukepoba.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1630480db2---ramizufobokikololakotu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b0fb52e0---32043378003.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c41a014e7fcd93a72cfa1a484b63eb23/lorimibopuz.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/m99mii9gfr40vjqmneo2hjudk5/jowetuserazaza.pdf
    • https://nnt52.ru/userfiles/file/nubisumawadujir.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=browning+buckmark+owners+manual
    • 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_off0000ed35.bin
28b9f77a63c1e38594cf885bf61232bb1835a14af20ff80d897261a4420b0fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0xED35 16752 bytes
font_01_sfnt_off000118d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118D2 16792 bytes
font_02_sfnt_off000130e9.bin
3e74cb6c5583d090c2181e99f4fa8ed6e83a29370ad55e6ea3f99ef1efadc645
pdf-font-stream PDF embedded font (sfnt) at offset 0x130E9 10948 bytes