Malicious PDF — malware analysis report

Static analysis result for SHA-256 164101e5d2a1d5f4…

MALICIOUS

PDF

86.0 KB Created: 2021-07-20 23:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 50189f07464eff65f431f97a8c8040a6 SHA-1: b03dabebbe8ea97839c758903568b1f1e85e6e9d SHA-256: 164101e5d2a1d5f4ab5dde649bb8862efe39ef97ff50bbbece21784f62e8f0e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or redirecting users. Heuristics indicate the PDF acts as a link farm, pointing to numerous external URLs hosted on potentially compromised or disposable domains. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cukiernia-waltar.pl/qcms/userfiles/file/vopofesu.pdf In PDF document text
    • https://alyansdugunsalonu.com/userfiles/files/sodolekok.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/37858475712.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4834e75f72---reminoganaxat.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/83btdvuof9egfnnj9auisrtb2r/sajimuwafupiledeju.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2729ccff6a---34355018510.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/tps6s6f58i4530eob8g4jbm137/66238647788.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/pifobikaresalipokonar.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dfd76445c09b899a32d6a60510113bb/zexukoxab.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/53887987483.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbeb1637c8---36820709822.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/tobepifodizukagog.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d433fe5338---nujonugujet.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608116e9a215e---90368588501.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/fiwisidedebuliviso.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eeae6145197e42e4c16e4d243e0ed089/wigadukotituvogefiminawe.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/bakumap.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/buvupetozuxeliju.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210627221132.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/57473086674.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/89221750938.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/bvv0ls0n1d8ujnbl9jk6pv9lk2/seneginu.pdfIn PDF document text
    • https://forthepeoplegov.com/userfiles/file/13663061321.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/2rcv8mnlc0sjmn9b5vvsfjjijj/nuxabeloleladisujapupa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=baking+stuffed+chicken+breast+at+400PDF 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_off0000eaca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACA 11176 bytes
SHA-256: 2f867512afe005230feafa6174e1693691308b841721ad1984a3335177bdd98f
font_01_sfnt_off000104bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BB 17476 bytes
SHA-256: 7d49e3cdddf903c0a85447fd2773b0dbbb72c116bb9eba34a225e37c6882492a
font_02_sfnt_off000132a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1