Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf871dd4b02d869…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 14:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c1174cc52196f7fc17e29567fc276d9 SHA-1: b0ffcb8354e0986f0e0cdd51089a4fa632f51da9 SHA-256: baf871dd4b02d86952a5f4e596ed733e8e8b0eeb12025c77ead63e96340a1950
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vimar.ua/userfiles/files/guxuf.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae395e5aba---sasesitizovuz.pdf
    • http://thebankcardservice.com/uploads/files/86750053530.pdf
    • http://dgjst.com/upfile/file/95849458159.pdf
    • http://ebrinteractive.com/userfiles/file/16421835663.pdf
    • http://recko.ru/ckfinder/userfiles/files/janademusogevedapupafo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145e1caeced8---87641141927.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e378855a---81722448141.pdf
    • https://hotararicedo.ro/files/files/puwob.pdf
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/43820593970.pdf
    • http://chukguwang.com/files/fckeditor/file/kivul.pdf
    • http://yousefmaktabi.com/ckfinder/userfiles/files/67285678612.pdf
    • http://volkshilfe-ktn.at/images/content/files/31150291835.pdf
    • http://bkmarine.net/ckfinder/userfiles/files/1631978172.pdf
    • http://birkhoffhi.com/userfiles/files/32264268051.pdf
    • http://www.look4job.gr/images/_user_na/file/50305112093.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142a8eb775e4---60691423519.pdf
    • http://erpsamik.com/ckfinder/userfiles/files/34483258982.pdf
    • http://investbuild.ru/var/upload/file/51094174019.pdf
    • http://dj-maily.com/uploads/pages/files/68425652177.pdf
    • http://phutungototuanphat.com/img-tvdl/files/giribukinekiwif.pdf
    • http://unitez.net/images/newtech/files/tobatejefekosubijumino.pdf
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/bikax.pdf
    • http://jatechkj.pl/upload/fck/file/2171704924.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=hunger+games+book+pdf+download
    • 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_off0000debc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 16792 bytes
font_01_sfnt_off0000f6ce.bin
bea1ad1aa214644a257e07151bd5d1b6e98ff34d47bfaaa76f7548467dba3739
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CE 18372 bytes
font_02_sfnt_off00012619.bin
baff67cfbd82a9d9443492e7aa3ebacb4a562b43bbbb25f325a4a2626fece15c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12619 11060 bytes