Malicious PDF — malware analysis report

Static analysis result for SHA-256 706dc74bd814da31…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 23:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7c6011e7eae2c52a7f7fbea9d7cc2c11 SHA-1: 06ad3e3a7b4e1326073870a7df986198f9e2cad2 SHA-256: 706dc74bd814da31eb9bd43f6dbb9387f34344633ba9f1c13d346755fa373f12
156 Risk Score

Malware Insights

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

The sample was detected by ML classifiers and ClamAV as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains, likely intended to lure users into downloading further malicious content. The PDF structure itself is indicative of a link farm, with many external URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/3993849919.pdf In PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bb722bb2e---pababatele.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8ac8a457a---welamabatodivivon.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/707f7be287580b1e82ffe5944d27e272/92117410663.pdfIn PDF document text
    • http://faw-asia.com/image/upload/files/zemomigizuxefesud.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/25934420140.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa24979844c---jomugaronagebabere.pdfIn PDF document text
    • https://securitydm.com/slicice/file/93796753182.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/57032623981.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/84635732185.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/e0g6r8bsvj8ki4i7tmd6vg8qr5/fifeluruxudireka.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/3mqi96abma81qgf46sba56vago/rexafilewetivuf.pdfIn PDF document text
    • https://aspirans.com/files/file/nisunemokuwuwugo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef58c5bdba---36779349868.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/xuketedosot.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/77261723683.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/429cd66866b350af6de168c40c468bd0/misedizabes.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a75eb567b6d---28368047781.pdfIn PDF document text
    • http://patroha.hu/file/biserirojupekawoxutosisa.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f8db8ccb---zodefe.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092026a392db---58023192593.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070474165145---97752416992.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/62974960482.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=english+for+today+class+6+guide+pdfPDF 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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 17348 bytes
SHA-256: 56747e32527a77c70c3744b9548ca924de2d5e837697b419a7aba3e624eb52fb
font_01_sfnt_off00011cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB5 11264 bytes
SHA-256: 2e05b51f1cb2a2cb04ad7755cd914cd8c9d502426a0c1aadcb563dc21694cb4e
font_02_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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