Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af5368c01cddb1c…

MALICIOUS

PDF

104.9 KB Created: 2021-07-31 04:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e91d0f2017cdae1156a666b5cbdab454 SHA-1: 5986f346915a253cdfee28045803cd865a7fd30a SHA-256: 4af5368c01cddb1c8e2ca4c26768ea7ce4ad94b09597c6cbd17d5421f03a58d4
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, specifically targeting their file upload functionalities. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting suggests an attempt to distribute malicious files or redirect users to malicious sites. No scripts were extracted, but the structure implies a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ccb68fca9---67158158553.pdf In PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/770efaa91f2abbc4f3e63ebbe806d68b/medaxoremizej.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968c984a882---zobebaruxomava.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a1764d15c7d---82702293170.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/84410355692.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a665edd1e8e95bca454badc1b0cae373/7782497457.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/0879eb6ca704af9365c8e3e999f79159/33898596124.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/87333191950.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/44739546830.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d352a3690e---gujigabifer.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608450aa96188---11682474130.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/4iic208f74cu2k2oilqms7s7cm/57361562010.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760bbd58ced---kazaniputajifonod.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/zozetutinosikewakavezexo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/xajis.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/62162051282.pdfIn PDF document text
    • https://jotelek.hu/files/file/loguveriduwi.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608321244028e---fuvapubo.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160859cd521bcb---65478480547.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a29a026296---77311685769.pdfIn PDF document text
    • http://vanharteyoga.nl/uploads/files/61152197923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=edgar+allan+poe+eternal+sunshine+of+the+spotless+mind+poemPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13077 11028 bytes
SHA-256: 245cfdc6c46e4c773293ee31ee50aeed6fb42b5379d917a0a7bb4074bf62c19b
font_01_sfnt_off000149a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149A5 18352 bytes
SHA-256: ea194551348185d3ca62b8d8887f401525e2c10eeca504a0a0e52a5ff5138341
font_02_sfnt_off00017a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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