Malicious PDF — malware analysis report

Static analysis result for SHA-256 8397a02b166e3684…

MALICIOUS

PDF

89.7 KB Created: 2021-08-15 01:21:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 12cf1b8e800394af594c66608f422799 SHA-1: 178c62c4d9cc7bbcc90ba7e78432334fa16e9c0b SHA-256: 8397a02b166e368422fd85e6a03fec706685fcee46b7b0fb8292a52343bbeb31
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to deliver a payload or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://ketchas.ru/uplcv?utm_term=how+to+get+answers+on+edmentum PDF link annotation
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a819891d67d---84069289349.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5b90e919c6467f6a5b5a9b9b4e380459/dizuzoxab.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/7rf0mrc9ctr7fcsv9461lrg18c/fefefewonevi.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/tejedawodeju.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///379573084.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/4255947344.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb57717ae0---zobufenijipefojejimesiba.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761b486c2c7---73541035207.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160e4446dbff9a---84825596669.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2d1533be9---44232805160.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gj77ic7q51knrkn8j03otmmh2s/32888388661.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/fah900acci357p1fbmn4ev2qsv/sikebiguxuniterox.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/kajanegatobafopivuma.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/98225063468.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/gj56shkqdfjcsgpitl648rtt77/vifuxuguwuraselorimuni.pdfIn PDF document text
    • http://redactron.com/userfiles/file/filod.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/852vdikelu1tojn7cvd618ntib/nonivukobozar.pdfIn PDF document text
    • https://dineflon.com//files/28418067498.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6875427ec5---sosasixufiviwa.pdfIn PDF document text
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/webekegokazumadi.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/kenefutumuze.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3aad58fb9---tivej.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/37393782230.pdfIn PDF document text
    • http://e-hematologica.com/users//file/34918117024.pdfIn PDF document text
    • 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_off0000f6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 18436 bytes
SHA-256: d2821e5f644376b0ffc691ad9838481cc0c6fd78edeeac20feff7b9dc6fa4e37
font_02_sfnt_off00013fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB2 10628 bytes
SHA-256: f72467acf4b1995ac059c8b45bfaa94037755ced129d9b8d09bc3f4b10b78fff

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