Malicious PDF — malware analysis report

Static analysis result for SHA-256 74133b816ddf0848…

MALICIOUS

PDF

103.7 KB Created: 2021-06-27 03:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 81f29768e64d01f738d3244fa4f04b40 SHA-1: 21754b4845b8d22af2324a17335f884de222eefa SHA-256: 74133b816ddf08485d6e2cb62fc1e9ffa1e0edea7b80471ed5031093b36fe7dd
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the Formcraft plugin for file uploads. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The document body is heavily obfuscated, but the presence of link farms on potentially compromised infrastructure strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a22c8944be---setudisile.pdf In PDF document text
    • http://php-lounge.de/userfiles/file/zutabipobupevajuli.pdfIn PDF document text
    • http://thomasbelldescendants.com/clients/40432/File/fituder.pdfIn PDF document text
    • http://simonide.org/userfiles/file/99538759249.pdfIn PDF document text
    • https://capitalsyndic.com/userfiles/file/zunegakubadawajuzinev.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/971e0288214c5de93930ccbf0bc314ad/luvafedejozalinowe.pdfIn PDF document text
    • http://brukbet.com/user_images/file/defimonubizepadupusuka.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/27c4af53f575be2383125b86725ed224/69456981687.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/03b79856d84991886a6731d85c16218a/32909036677.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4dbad11b0---64798485329.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836f31c9eaa---gulogogilamokumuzexeziw.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/bufonogine.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/taqskjgc643nkp1m56p7tvjto4/riwibexujisubajikunigu.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba015cb6f23---nozomewawojepejexe.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dd8468ee9---pigepupo.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/bogasetijakazivodutafoma.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/frd9o4d1503r9j5do21p69p4bi/kilizuxiwubif.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/48182477250.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084132eb308d---detepadunirap.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/pdro2cbntpgjrvc05bodb0r7o5/bobuniroxiboxinarij.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160860454ce4be---nivoxatediredikiligesoxej.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c330b00dd4---20347673373.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb0345ec44---fudepexa.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/24695011953.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/22383927213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=words+with+diphthongs+oi+and+oyPDF 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_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 10688 bytes
SHA-256: d4ab8387a1520b6b5a05bcce631ed58b87dba86bef78b021e200eb2016c5e44c
font_01_sfnt_off00013ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001580d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580D 21204 bytes
SHA-256: c6fb3b1a46b57bf57cd0f957d8f23d339cc8915411335c9c4326923eb072d21f