Malicious PDF — malware analysis report

Static analysis result for SHA-256 441728ba3e4b4a6f…

MALICIOUS

PDF

76.5 KB Created: 2021-09-14 12:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7e1beb2c39daa99b230c2fd52b25b710 SHA-1: b76167c81c01689ec1652643b2a654b0703b9663 SHA-256: 441728ba3e4b4a6f86d1992d798106509c796ee831a4ff274aa8ab43af3ef05e
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The PDF also features a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to obscure the final malicious destination. The presence of embedded JavaScript indicates an intent to perform actions beyond simple document display, likely involving the execution of further malicious code or redirection to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7965

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.
  • 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
  • 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://mmgrowersg.com/ckfinder/userfiles/files/xuzigol.pdf In PDF document text
    • https://listapp.in/ci/userfiles/files/lipuroposikedifijagev.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/fcf0ae06d986a3cc76024f3cf8f86ef0/ligavupigomajajijubunuju.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///37963142195.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/biguwixelofer.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/94993619826.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/75519177861.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/99521552722.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c0afecd98---72598872695.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/zedufojatugabubusivur.pdfIn PDF document text
    • http://ckm-machinery.com/userfiles/files/41093584528.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/423633843.pdfIn PDF document text
    • http://mijn-nederland.nl/userfiles/file/4718736198.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c3cd93677---67902358634.pdfIn PDF document text
    • https://hiddencliff.kr/FileData/ckfinder/files/20210911_B3310FF3B970A270.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/fofaradozisikopejok.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f952447c12---dedobanufazugolupi.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/xapugorototezibesimuwesed.pdfIn PDF document text
    • http://polipack.ru/content/file/gegunejomotakogazimi.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/potazolemodiwabiwa.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/25925819199.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/61909924338.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/zemupadupezenopoj.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/9748442591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+transfer+whatsapp+messages+from+android+to+another+android+phonePDF link annotation
    • 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 10976 bytes
SHA-256: 23422c62cb00689f36ab374d62ac44cac9e704f7fef39a7b3c19ce83e4252b33
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 17844 bytes
SHA-256: bb04a81572fd4eb12477a21d43f49e69ffdc9301e30ba6dd89b86532f19a0d39
font_02_sfnt_off00011c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1