Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7271e2d6f11916…

MALICIOUS

PDF

91.5 KB Created: 2021-07-13 10:57:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4af77867177e492a8c7a3674124a05ce SHA-1: 426e21b864bac0c576e241f4084106a3cc7b6e81 SHA-256: 1d7271e2d6f11916dedc34d924803ea3fec9312bdf38b3b150407a288b3dde6d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS upload directories or disposable hosting. This suggests the PDF is likely a lure to direct users to phishing sites or download further malware.

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 http://ohsongpharm.com/ckfinder/userfiles/files/25437534697.pdf In PDF document text
    • http://centralcogtc.com/uploads/file/74152707281.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/dd7207b6d630a79b41f635318c99ee6e/63805431121.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/5937e81c85b89161e15139ec963c613c/80207740886.pdfIn PDF document text
    • http://hotechike.com/files/files/35838915057.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/82670046993.pdfIn PDF document text
    • http://mebco.ru/images/file/64385180531.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14212261602.pdfIn PDF document text
    • https://purefeeling8.com/data/file/56600130158.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5e2ed1484---1194998052.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/forudazugunan.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/13877817632.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/25678375539.pdfIn PDF document text
    • http://envigest.cz/upload/file/67682242612.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/74215049910.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba873cf26---kokimanusozirazap.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/913cf22832524f327b95b20efe68ec78/zerigafi.pdfIn PDF document text
    • https://webtechnocrats.com/upload/file/tubovudevonepuzam.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3a5ac14df---94556177928.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4921e9f620---kubarovonunuma.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/nidugudifonudixusufa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/79edc2251ee32d5b42d5151ea0bee22e/26187583555.pdfIn PDF document text
    • http://denkobarbell.com/_upload/files/tapisukisape.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/fc12e97f1600da8b28c2dac5fbe2a9cb/wazusifejofekib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=linear+equation+form+1PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED34 17484 bytes
SHA-256: 79f19a25fb62efa074b7d9d13995405e1b6768a0b47dc5bf6c04e658ef87d6e3
font_01_sfnt_off00011b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001338b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338B 10416 bytes
SHA-256: 1f8f9371a3cdb64ff12392a2ab818faf47515956d550c1d1c295c820fa8937a4
font_03_sfnt_off00014b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B27 16084 bytes
SHA-256: 325c5f5cda05429ae92d15c23118ca1b8712e485108c584e1e30b0ff615913b7

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