Malicious PDF — malware analysis report

Static analysis result for SHA-256 1faab9eaa6d8daf0…

MALICIOUS

PDF

150.4 KB Created: 2021-06-30 21:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: d1a2018a4b7b862178fa5aae255000ca SHA-1: 82d3a0a1c37ae3872a051f42476506a60d64f4a7 SHA-256: 1faab9eaa6d8daf02fd4532d33b4d7dc207d7ed55cacb5a183d541a21fab075e
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of numerous URLs, many pointing to potentially malicious content, strongly suggests a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

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://unosms.us/userfiles/file/97837758640.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6ca1cc78---98206104226.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1869d1eab9346129d4a771c299923580/vaferuwed.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087b294ed9ce---sesovofiparutazeluvaj.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/89110139835.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1607db092655d8---ludepesojawodufijo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160898c57dc6e9---vozegido.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16072b3f1a63c2---32651390465.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/gezoxizopixulu.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/92053168351.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/ctvb26dqnch6f04hprssedqdb9/6640101582.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609605dc4e4ae---32914429028.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/deb92de9cad4bb682d5db73f873dd549/66816188016.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/c1ae10e728dbb83c9500b4715ef848b8/dezepumavutasazitalonega.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab24df9515a---valomeluzeba.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da13b8ab4a0---kuxurululodip.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/6eacc33b7dceb2a8430fbfecd59588d6/82447703127.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/62267159875.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/winowiragenofifelafifuxaf.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/4cb220911d4d214bea1e7afde6253599/kebapiwodopivizonazexu.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/22292614193.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1b9c993e---94157242060.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e15dc21a1---jagiminorowisutuvobukuni.pdfIn PDF document text
    • http://ketoanaca.com/uploads/image/files/14019500499.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/36074476118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=french+subjunctive+explainedPDF 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_off0001b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D5 19244 bytes
SHA-256: 94849991c6442a2415f83e6469b0946656dfa0d9388c47f38132719845e7709a
font_01_sfnt_off0001d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D865 28212 bytes
SHA-256: 9536842a4b20d2aef06603d28902cfdefbbd8120cca69f5792c8eabbc10c2f39
font_02_sfnt_off0002183d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2183D 11008 bytes
SHA-256: 9b0d7eeaa719a91ba9dc6c957d8d6b7124c73143bb9ac65dc61e36ff9e8ea4ea
font_03_sfnt_off0002317d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2317D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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