Malicious PDF — malware analysis report

Static analysis result for SHA-256 18db288356d29a9f…

MALICIOUS

PDF

90.0 KB Created: 2021-06-29 06:17:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c29667f00debf6086ab2d6918e46b8fe SHA-1: 9565757fe7ee4d8f279053e8d3f694dcb293decf SHA-256: 18db288356d29a9fe7f80462537aac5da71f4e70bfbee662bd614aaf9cb7d4f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://synerhu.ru/uplcv?utm_term=spot+the+difference+kitty
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160998af10eac3---39256411207.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afc7a8a680a---57333728066.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/9286dadc1573b04c52e77772e7a9e19f/78643629622.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fed22824f---vugizososorir.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b32b25417---92219564875.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160849a01b8915---91320741759.pdf
    • https://avonsteel.com/UserFiles/file/54709317593.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e9f725a5---24134830723.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096f4fec0a7f---xomivotinojad.pdf
    • http://edumedcare.pl/upload/files/80013019679.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d1cee9adcb470176a236aec0128c39e5/nuliwuzaxedara.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a45f0fe3cf5---33239676148.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/42038ddfa3681fb3d0e9ded84fb1dc69/kizabakududuv.pdf
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c07986b77d5aae30d6d419f6a130d672/74612565201.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b783564ed77---37744000889.pdf
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/daff478c1a8a99231ed26294e7a3f4df/duxanipabiwimajulutisul.pdf
    • http://nationshield.ae/userfiles/files/buzoxigezuvilabagefi.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f663caf2---5070773246.pdf
    • http://magyaringatlanadatbazis.hu/dev/_user/file/81322186413.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/86tlshgdan3risaeqnn6manq7c/33290093930.pdf
    • http://ceskylakros.cz/userfiles/file/1321869397.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/95dd34bf1c5823aec148fd65cbd228c6/45218552619.pdf
    • http://wowbond.com/upload/Fckeditor/file/16160121910.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa024bb2b5---galulafuvugegoweripuxomu.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbce.bin
bbc714c6949d7f6bc28f3ea95c307aba3e0324737d3c64352f55f364a828379b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 22752 bytes
font_01_sfnt_off00011459.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11459 16144 bytes
font_02_sfnt_off000129d9.bin
c00a704aad50f79ab3aa9553e2172303c196f223c136c5e65205010791c67864		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129D9 10624 bytes
font_03_sfnt_off00014221.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14221 16792 bytes

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