Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1b2b8843649a70…

MALICIOUS

PDF

92.5 KB Created: 2021-09-01 23:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55120b0231bfa0141d8a1a5b7d6103b3 SHA-1: 3f81a5ba38c5c1365d7c22029d9d776c24817f57 SHA-256: 0a1b2b8843649a7060c1151d32ec83fafa02a44c28008629b726337d94bed9b6
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, many pointing to compromised CMS upload directories, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=pan%27s+labyrinth+online+english PDF link annotation
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8a323d7ef21a9fd372968cdc38a612d6/puwotobajawotok.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/37246140763.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c688e477da---dexodu.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/44356450877.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/bizipuwibapotudifesafebov.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/7dba5a7db74d3261640308c9665b4e89/bitojax.pdfIn PDF document text
    • http://edgecs.net/documents/wilorejotamisop.pdfIn PDF document text
    • http://orthodoxnews.us/file/11959795265.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/67h46f4v97d3gmgimqasn3jpf6/losaxenofabuwo.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/33493060860.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/75792719280.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/fibogalepaluzuxo.pdfIn PDF document text
    • http://www.toptehnik.si/images/79793032452.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ded97f13081c7eb37af896801235c1d1/20204334741.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/81762118986.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/mafinezikikodenibo.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/foxotojewa.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/2hk7tmt4ub2mpbq3s7gmsdu344/vemexudamedubezawen.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/jukamokodevuzejeto.pdfIn PDF document text
    • https://parkettworld.com/upload/files/zejuvepudejelitagefama.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/takuxomi.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e031e6cbe---zuvunifonugoxopefuminuw.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b33580801---89847522113.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001190c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190C 19188 bytes
SHA-256: ad0b07e6a05701a655a52da0b73ecba6072fbed299680d389fc49348e08a8360
font_02_sfnt_off00014b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B31 10676 bytes
SHA-256: 1fae4b32e806442acf04aa883e1c3e089be6e1d6f405b032a3699ae4a5fca916

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