Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae795fd76ba9e4c4…

MALICIOUS

PDF

107.0 KB Created: 2021-07-21 01:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 829823987b357005e1ef54b9a20036fe SHA-1: 837105057c7487e97f692f2c7bfe7a839ac0e9b0 SHA-256: ae795fd76ba9e4c496b5854d6ee2ea9cdaaf6c15985122336393acd847c2f935
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests the document's purpose is to host a collection of links, potentially for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9122a5cbc4---3395895227.pdf In PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/d22u6tlqe5umtjdili76d7jdm0/somudazilasopatu.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/59836147.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ei99g7qqv0brvoqasehkkljdq4/japasewuwi.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a6173077d1cee8180a779ec7a2bcbfdf/68677074842.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/8b0b4639c37bf56d6a066420956d61c9/lubesetinapa.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/riwevaxeganodezalulixime.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f1af99d45a8---zumexonin.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aa3ad6267---27983011422.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/94936814633.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/luvasefenewukisukewew.pdfIn PDF document text
    • http://blsfamilyreunion.com/clients/1/11/11e20eb1c47c3498ff3e66fc1941d138/File/32202720499.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16095f7f284058---9410169739.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/65375730357.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a7907595a---38419631525.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bea09e66c0---safasuworo.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee31b215cc---gawogumed.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vesepo.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/mamamefadagajane.pdfIn PDF document text
    • http://supporttmes.com/clients/2/26/2647aeee05d38019bb2ff7af4ee9f9d5/File/felufoza.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/345b4674308781e7316070a2be1eb85c/79621138927.pdfIn PDF document text
    • http://camonetinternational.com/files/file/87551980588.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6caad96d---vemofukowivimotejewejo.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/tikose.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=impending+meaning+synonymPDF 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
stream_003_off0001073a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1073A 22744 bytes
SHA-256: 7d14078641e45e20794b06be0638e21d528ebe417b6dac2892d5ac10949eda88
font_00_sfnt_off0000ef29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E7 10556 bytes
SHA-256: 25fda185baf05757c822ddcb73fdb4c73b59fb74d886231c9451e0ce6af3947f
font_03_sfnt_off000148b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B0 28204 bytes
SHA-256: f8279b611076711121307b44d56aa08b63c76e10d6eccd3724b9ac2c4ab8422b
font_04_sfnt_off00018bc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BC1 4400 bytes
SHA-256: fc72e30c91268578c562bb60837775ec6cce63c7fad6210d2c44cc66c42eb562

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