Malicious PDF — malware analysis report

Static analysis result for SHA-256 db4154f8213a59e4…

MALICIOUS

PDF

77.8 KB Created: 2021-08-19 18:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b76f227b39f84c952c91d252fcddce94 SHA-1: 7165b3ca0c256773efaab145e3aafc8d18f01065 SHA-256: db4154f8213a59e4749d6d3c74686a05ff4134568aef0a9b9b4605273bc9409c
176 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URIs, many of which point to compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The document's structure suggests it's designed to act as a link farm, leading users to potentially harmful content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090f44360799---sipadepawexuzugavim.pdf In PDF document text
    • http://china-zub.ru/userfiles/file/jatefuwul.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/29716972771.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///tadaxadixitodawejiz.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/a28017f99d27f010ad6cb05b7efa7f0f/68345440291.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/394ec1a73046d659c70acd7ebc9df1be/jumevumebiretogavek.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/7188107613.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/86227693075.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c841f425b7---44711838400.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/da9c8f090d626970de76dcb2e9ae1034/31179112873.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071377131e96---bubugo.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d06d02f9dd---71919820879.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608067417274d---60385747547.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524e71c92e---54995298111.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/52412834113.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f11d5cb5b9---godurewumenudasas.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/8fa2bb3b83f9bfbe784fcd276f2b26ec/57823257974.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/22860100823.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/96060893931.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/purulipametanabeva.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/disivubikalavurub.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e924e072e---10437413297.pdfPDF link annotation
    • https://vietspices.asia/uploads/files/73123905813.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021061913062490.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=dil+to+pagal+hai+songs+mp3+free+download+pkPDF 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_off0000c93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93A 11296 bytes
SHA-256: 0ebee4a6e8d942c2a3c359ba177c19b6ba76a494094bf5592d8f5462fcc72f87
font_01_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 16896 bytes
SHA-256: 002c7b634acc7b55b0fa9edadb0eb57d154469fb7b80411b4f50dad448f03f01
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1