Malicious PDF — malware analysis report

Static analysis result for SHA-256 9684405c227d2f5f…

MALICIOUS

PDF

106.5 KB Created: 2021-07-19 18:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 504445a4ac47221c5ab80c712221b76a SHA-1: b75d580232fc7eb7179eaa43dfd3a30424b9d3e5 SHA-256: 9684405c227d2f5f32a2a6f2676455f4a1bb14f7649a11b351688c7db4982f96
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d97095e05---pebiwikojifof.pdf In PDF document text
    • http://mail-ex.net/userfiles/file/42532490125.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/38813381790.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/21761078266.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/22525743896.pdfIn PDF document text
    • http://lucann.com/Upload/file/popelipuzizajin.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/9f2js44iaejp623qvs8qld4pd6/repuwatogiwak.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c562f9cdb89---gowexipotekumow.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b95611eab---59135148423.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/1qk3aenar6np5c0jp36it5n006/janakujulujodolasoxij.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c566cad8fe---62612850911.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f874624d3---belosemanogageve.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/56956047665.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa69e37e1---4200619197.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b18277abfa10a8ec4de6b49668e56f61/xolumusotafeselamudapomib.pdfIn PDF document text
    • http://dnepropress.net/files/file/73295812761.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/34534517978.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/62258795959.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/44278482712.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/34294150304.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/jolupifusetomikugepud.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/65714633685.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cefc45f832---3924032284.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/41848752333.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5c3f849382---vimerenekugo.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/032acbac71b87fa3e138825e1d34b7f5/vufofilojikalosenuredof.pdfIn PDF document text
    • http://veribase.com/E/file/pibibuwot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=free+vogue+templatePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141D4 10376 bytes
SHA-256: 89ab490353a49d406ead8d3920f3d3fcdffa91c04c24e01c03db4d00e0cda99a
font_01_sfnt_off0001595a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1595A 16640 bytes
SHA-256: 61c911ae0d54c21a2d1c9fe2b38677d5d5b6f294718a0a346ee62a993cfac3a2
font_02_sfnt_off0001848d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1848D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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