Malicious PDF — malware analysis report

Static analysis result for SHA-256 56789f1a343a0c95…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 18:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bdd3444950d453aa612b6288da8a4a2b SHA-1: cf22d479bcd23883956fcd3902233d9494922f71 SHA-256: 56789f1a343a0c956e6782cfdcff1e015ea9be976b342e124ccf0fa243cba5df
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://brianhaymore.com/images/e/file/jajofonepiforufu.pdf In PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7b36341e68af9686e9c1cecbd43a2695/58263419285.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/52238044076.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7118f1506d---topogif.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/3f8e44a3ff1090a305775e8613a6b1e0/94888298952.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/78619239870.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3c3a0f78080d65e34253788c95c47042/10600007965.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/14d599976522bb88a92c4b32ae88dcb3/63355151739.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/74623488109.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26724072255.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/53806872863.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/74173561776.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rebelunadopebokagagivoz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/fepubujozosup.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/6955353351.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a534dbcba3c---91161226567.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d5292e7140d---71477961650.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/i26rrua75teqd41hm3jv6vuaol/75233805889.pdfIn PDF document text
    • https://ahha.az/userfiles/file/pupapumageluratogilijizi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/049adb7c53eac297ff1172fd2a4d424b/89195735609.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/lodipodagez.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210713_055317.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/79317674514.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/68333636060.pdfIn PDF document text
    • http://quaint-house.com/pisewitadafegitizase.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607e931984d38---guvofinexebunogoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=gate+2003+cse+question+paper+with+solutionPDF 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_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 18628 bytes
SHA-256: b12299090e3bed99f510a2a6fbc248f36f2d244cb0ad8cadb546953c1948b1ff
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 11256 bytes
SHA-256: 8beebb26604f4a9faa5ca7ff03d5a087534b95b8db4a9edec3293ee4cb58608d
font_02_sfnt_off00013dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1