Malicious PDF — malware analysis report

Static analysis result for SHA-256 53849da668fc3cc2…

MALICIOUS

PDF

85.2 KB Created: 2021-07-05 01:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6efad2140f181bd0d8aec74900e4ac3 SHA-1: f8f785c5bec821423a5e15e4660f326946d2002b SHA-256: 53849da668fc3cc2c38784f191e5dd285366223fbf1d77396506b730edc3f71c
104 Risk Score

Malware Insights

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

The sample was identified as malicious by an ML classifier and contains numerous embedded URLs. Several heuristics indicate that this PDF acts as a link farm, pointing to compromised CMS uploads and disposable hosting. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a41888b47e7---zalifokovinobuwif.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06aeb33d5---jipejirojom.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/17bf9d63cf6bababd094d215ac6aa97c/93849257824.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097ba09646df---88349790892.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160acdff619e98---8533116115.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/g71a2jrvm406v5992h09er4t42/lukakogojosel.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/xobazusofako.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/19nv2sfiu7imjfkgnnqof5opna/sunedenivifur.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/88222505539.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dcdb10592---vanig.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/karapegumimabolol.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/ug4bu941nb3a2ug3eeq7v6iaq1/29095089248.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7b0d7771---70989204163.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/aqjm4mklqjuvgirpn900081c73/biwebimumipusevabugozidun.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a6734a466813a42e190ae1e9d0e54a60/2801107590.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/62865888930.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/p04rgogf3kqhrs3i1khbida9m5/xexuralom.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021519938489883.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607481b45d125---57699877125.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/2ff42d19a3d5d852a7aa2e02610196d9/runaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=disbelief+papyrus+phase+3+fightPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF89 17112 bytes
SHA-256: 885b9024a80bd539ee88f4c17c1e1fa3cc6dab475ff5b740ebf17c73a317c9ed
font_01_sfnt_off0000d866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD866 3356 bytes
SHA-256: 1320187fa37e8e4a82c9ea2a5e3376cf757f516d2d7be8e6e6e1a0f3adc9c2ef
font_02_sfnt_off0000e5cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CD 10940 bytes
SHA-256: 559e83351a3f344084660bf50bfceddaf81e5e11d2cdf1812fe5b35c46dd594b
font_03_sfnt_off0000ff24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00011736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11736 17908 bytes
SHA-256: 2479d38814519f71e9f8c5021296b2e2c44c6599261b72a81862cd82d2db7b48

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