Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdbccde71a2cadf7…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3a31043532779cb0d9de20a67b8d704 SHA-1: 489c8b452c560225b256a30ca7daf6fe19647ad4 SHA-256: fdbccde71a2cadf74e74e1990bb31d275613b14b99ee6e8380f208f725f1ef76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs that point to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads, aligning with the characteristics of a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://queure.ru/uplcv?utm_term=how+to+cook+something+in+minecraft
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/lokepumur.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/cb61d035d4c14a657af8b528b27162cb/99539627239.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081459aecff2---48169071325.pdf
    • http://chnli.tw/CKEdit/upload/files/bapojibi.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4586b641be7337f77cc34045d27fca31/biniw.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b5ecc1494---davugezatozexubifaz.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/j667pqojc24fssp4edo6p26lip/zasumijojuralunavusobifer.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0d6a67579---duwuvurawomi.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e6831e7a---fifegejat.pdf
    • http://qtjdb.com/UploadFile/2021/05/12/file/20210512_221813_127.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/bi1e0nfbqs0uuafupct582u5k7/61849798666.pdf
    • http://citra.cl/userfiles/file/26255412469.pdf
    • http://goodtraefarm.com/ckupload/files/leguluwevuwujatamod.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a54e3314e---1655989030.pdf
    • http://nadiadsa.org/userfiles/file/8317020463.pdf
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/94b4e75e977a61305c78164d0fe97e68/49981640868.pdf
    • http://vogiantinhmach.com/media/ftp/file/wifovuzenetoniliwab.pdf
    • https://bookatowncar.com/userfiles/file/xepibavoj.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/66397245507.pdf
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9010c906e---jubumuwefefo.pdf
    • http://ecovn.vn/uploads/news_file/rikebavo.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8c207edbec---joselarepa.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0cce52d28d---38467847329.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecea.bin
ba73306e57bd0ab0703d5d8e52ee83683db797c4e5bf93845588ac9821ae50e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xECEA 10908 bytes
font_01_sfnt_off00010605.bin
4d8bdf2e1c906b1ee0dea760d22108bbd0f495ea34e375fb7b2f8a3aadb641fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10605 18028 bytes
font_02_sfnt_off00013554.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13554 16792 bytes