Malicious PDF — malware analysis report

Static analysis result for SHA-256 305cc737f662812f…

MALICIOUS

PDF

90.9 KB Created: 2021-09-02 03:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1098ee277cc86cc6808317455515d242 SHA-1: 9452bd2b136bf1e2b3ccc2b1265959b6e587c872 SHA-256: 305cc737f662812f25a408fd10fe7c8683811afdc6e968bb5987c68116ce369c
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/297b4550a94d2eaec5e0597c8001784f/70914799478.pdf In PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734aa85c6e4---31278680131.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/6llc0fj0hgp1l89rl4jo11acaho9133a/91488155144.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/e7b442c536ab90ca6f49b54218bfd509/fajixijopikixopoza.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8ffb6fe71a6407a5f6c1880c734adf9c/dunexoforeni.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad718822294---45124005898.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080343d02e60---wojoxugaliridarasotani.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/62699735395.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7fe36be40---vusuwemeg.pdfIn PDF document text
    • http://hydrem.ru/images/file/xugej.pdfIn PDF document text
    • http://thaidicattery.com/clients/f/f7/f7b4890cfba443994123e46b8078d6bd/File/52322766805.pdfIn PDF document text
    • http://azs-szermierka.pl/zdjecia/fck/file/58692509091.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xekibudo.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d964674c9---lerisudedelovamadoginisa.pdfIn PDF document text
    • https://seeyounow.net/userfiles/file/44558739423.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb9db0ca41---57888034133.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16107f2b03a35f---54687366640.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/srv6u0sviv5i93toi1cmtb554a/tividujetuzirenotereviku.pdfIn PDF document text
    • https://nasco-ye.com/uploads/file/vobuxigoweboxebaxepi.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xabigokepe.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/s23uv0kobntq5guu46vo2ceri1/40686032191.pdfIn PDF document text
    • http://www.ciesol.com/ckfinder/userfiles/files/sonuru.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/epts30vtri9m44suk2c9q68ba6/86324280884.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/durafadufolafosodojawux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=palms+constantly+sweatingPDF 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_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 18468 bytes
SHA-256: c9ae0b12b451732064dcf1ebd4ab1ebe89c4596fb2b8200c972c9d1f2fddea4a
font_01_sfnt_off00012d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D07 10676 bytes
SHA-256: 3027598f9d85c17d6675570eb3fb5dd9417c4a310a752f51c50eb5e24f2d4b75
font_02_sfnt_off00014599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14599 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1