Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ea0b1a575f47fb…

MALICIOUS

PDF

82.9 KB Created: 2021-10-07 23:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 469347f71b5d08a1d8a376e63566ca0b SHA-1: 2f836d5e01c909306c5f453f0ff5e09d2da7d0e4 SHA-256: f4ea0b1a575f47fb7d75a624052ec7f322a7dc7e686c91e1df451b61a5d4f49f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript could be used to further obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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 https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/bb96912fcf95d9ed673b415f258ebbbd/bapekogepe.pdf In PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16135f5c4a26e2---vejevofikorikotumetatebi.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/7589340451.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/95014076649.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/j7kjru0fuli871qk05ehk7iio5/nedut.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/62648712953.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/judiguvu.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/45634691548.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16140456444363---36828136278.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/69145037684.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/9715242961.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/lifumujanobeduf.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210912_212106.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/63899586091.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/67363708493.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/tiwixarazoxelukorosoj.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/nowarasuxuginavelisax.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-21/20210921155922268218.pdfIn PDF document text
    • http://symbolfoods.com/files/file///wurepuvudulopuralalemama.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/zegagul.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/tiguforiwisubovupisojapas.pdfIn PDF document text
    • https://cfi-registration.org/buzzboxgift/img/userfiles/files/vovujolalatekavebagape.pdfIn PDF document text
    • https://shioturboapi4-xyz.com/contents/files/27824203004.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/punubu.pdfIn PDF document text
    • https://takarasushimn.com/userfiles/files/dovuwozupanoliniwu.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/xosowozadodaloze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=canadian+soccer+championship+2020PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93B 19480 bytes
SHA-256: 7120f70a527bdd7894261d6c5934fe87b28b90ff95b20255a1d8235c281454bb
font_01_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 10908 bytes
SHA-256: 6d8ad00c6625fe275b43abc34f004c89c10f4924d5fbcff51e22a10cd9e02062
font_02_sfnt_off00012535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1