Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ce59d59c7fab90f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-26 13:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f0b061ec0b6266ccc5983ac9c7ec89d SHA-1: db4f7aaa1909932121cd0593005123a0e8b75988 SHA-256: 4ce59d59c7fab90f553c2a7c10bc6784c1975ba9c530494a13f379588f992589
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. This pattern is commonly used for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=how+do+you+calculate+the+area+of+a+semicircle PDF link annotation
    • http://rzn-house.ru/upload/file/xeridoxog.pdfIn PDF document text
    • https://mimpi1pusat.com/contents//files/92005146913.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/65742242613.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/c34f0678558be012dcf2943b880c675c/54111865932.pdfIn PDF document text
    • http://potlista.com/file/files/24066631519.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/94052486961.pdfIn PDF document text
    • https://506hlapeta.com/files/file/jowalarezumaworubotigiseg.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rjfuopq60qjfvdjaqbibrc0km2/dejefuw.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/20691650007.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/fagusovasakoged.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1f22a56d3---53083106487.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/81051438340.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e94a3d931---vubogoxajakagufosuvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5c9647335---67249785589.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16119acb3abeb4---16555097018.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/jivixirulirawuze.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/1f3da1bed6b807210f0b36851bb913f2/potadeviwadivazukuzi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/jp0713un8fmdndilrlpn627k0p/58802659737.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/faledolamaninuwen.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/futufusadelam.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/b75029a0ecda8a1d5a09000e69e48ebc/58875629294.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/10631332102.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/18411894665.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/kisad.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 16152 bytes
SHA-256: 385ef3f0ff0bf84ae513889d6898d061351a028a0a96306e105f68f5e05a6e32
font_01_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064D 16528 bytes
SHA-256: e5386fc34b9cea636fd70d5759c6161aba7adb65e7dd85f3d6250d8e16e3b05e
font_03_sfnt_off00013135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13135 10928 bytes
SHA-256: 148416a0dc67b1c1bb1e6e3bdc925ff5f69f0903c80289921a2e855eb146b15a

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