Malicious PDF — malware analysis report

Static analysis result for SHA-256 104a88692bc13f2c…

MALICIOUS

PDF

168.9 KB Created: 2021-06-26 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69945daf534fa202bacf3e47991fb9fa SHA-1: 8ce8565022e8c91be83bd9a083b0f1048ce11bc9 SHA-256: 104a88692bc13f2cb103f470030e85a92d168567f75b973d6e36fd4310e52fde
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or malware. The presence of 'utm_term' parameters in some URLs suggests a tracking or campaign-oriented phishing effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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://cructi.ru/uplcv?utm_term=led+me+to+believe
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ea62265fe---gadivogumimavubuwaxanoge.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7df581a76---25262194605.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc04ddaf3e---73739277970.pdf
    • http://regimhotelierbucuresti.com/images/userfiles/37380353824.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43ad9cdfd2---jevaximobekevowini.pdf
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/2642c0622e93c77cb9d53fc623f37df4/7149235664.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606d19bf0f462---besavaxeka.pdf
    • https://samyenngochoang.com/wp-content/plugins/super-forms/uploads/php/files/g3mibf063sav5p9qa888pi20r2/wapiwabizujadanetasaf.pdf
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5b55002c---22873089484.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/alki8dssne35gmj0r7ugh21kfe/71346259078.pdf
    • http://alpha-th.com/userfiles/file/xoxilidoteboginogaxesafal.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0acf34e8d---lakawusor.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893cb6c473---zegubad.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09ec3346bf---fejobopimi.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/acj6ut9atgpltq62agk3850hlv/sepobanozirowotazu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d376eff91---78312637798.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc209e9ec7---74170335328.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/oiumd9j199cniv91045mi9o55n/xejeb.pdf
    • https://aawyx.com/sites/default/imageuser/file/51323856560.pdf
    • http://ajtoablakcentrum.com/_user/file/jogutodajexemafarafu.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/502vdmul73d7a4onld9f0u1rgp/tofekelogiwil.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/50436072270.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/u603lm745pilp3vqi2tvc0sqoq/sanodijenolij.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff500de0fb---nafinunifupakesonen.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_off0000fe84.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE84 16792 bytes
font_01_sfnt_off0001169b.bin
47d66a9f499d9cc299da402ac60f67746e54cb6d6c6c022471b731744d42d22e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1169B 10040 bytes
font_02_sfnt_off00012cd9.bin
af503ae47ee2fa7e8107a7f674ca3dc8b6844122325d21a1a307076dc57da1d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD9 127580 bytes
font_03_sfnt_off000266ee.bin
17c7bebd78157db96c65f5cfd18dc66e5fb8dfbb0a039ebf9fd15183137abf63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x266EE 17764 bytes

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