Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5dd9589da9df892…

MALICIOUS

PDF

118.7 KB Created: 2021-06-25 23:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 86ae7bb687674fb32476e4441707b2b5 SHA-1: 11a389d9c7b7c891f78d713a02ce644b8863f171 SHA-256: b5dd9589da9df892a24a83974e37da68bcfcdc7d419cb7bd09ebd1689e2edc4c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to potentially compromised WordPress sites or disposable hosting, likely intended to lure users to phishing pages or download further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/5e779641ef6a3fbf51c8f4e421bf4d0b/39050106071.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cde8c7dff3b---tafofiruvip.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/futow.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bkr3n1podsqusc4m1996ltu5ee/kiwumosedowavizinaf.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/xosamapatefidesowalajibos.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/tm764aae2lio2ges1krni82pum/bidaxukuwutobogedugutone.pdfIn PDF document text
    • http://yuha.be/_files/file/golakomasozubep.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160adef49bb340---57801473335.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a37edc346c2---wukunenad.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbbdc65c4c0---zozopigodozonogekeraga.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/63785751753.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/60026746443.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/0cnmiqigkvhs076d6b0sj0fpg3/78425718197.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/18f709222f19d9038d18593ffcea5e3e/52300837591.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/117749744008e164070b5baf916aa860/nerapebakav.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/abc6f6da7fa4360e3e2fa542ec2e8964/mukakegogonopow.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/76447454334.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc79ee805c---wetabanibabomo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/n4tro8mncgkot16rlpnmb0l43k/61696474366.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/84408469447.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/geg9lc9a920ntjub4cj7lrhvbl/risoxozip.pdfIn PDF document text
    • https://abeess.com/userfiles/file/77723077050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=transfer+function+to+observable+canonical+formPDF 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_off00015435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15435 10768 bytes
SHA-256: 61dd3f3e79ae68d6fdacbd12cd7ba147d4c9222f2d5abfb97b91abff5c5af4c7
font_01_sfnt_off00016d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D01 16280 bytes
SHA-256: e2261041576f8723b898fd1be77834218bb2681e1f864527dd57a680cd77f124
font_02_sfnt_off0001830d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1830D 18892 bytes
SHA-256: c98cd23b606bdda36497eced64872be09c21087beca1fb2bc80aa742dc6566fd
font_03_sfnt_off0001b48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B48D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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