Malicious PDF — malware analysis report

Static analysis result for SHA-256 edfc837cf2075e2e…

MALICIOUS

PDF

90.1 KB Created: 2021-07-13 22:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d181e7a34e72ca7a7078481581063046 SHA-1: ecf9d46e72d4fd0151c5c0f3c2d02aec883693c5 SHA-256: edfc837cf2075e2e157cb5e493511f07058bbce143861be89b4dd29bbdb80c62
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://rmp-traueranzeigen.de/cms/files/bowenakegagunal.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/37a9423a7a06302f38a631f866b52e59/bibugano.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210702215931.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/pusanulufoto.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dddb48679aa0990d05423942fd79960a/fimilura.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/58395658101.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/67922077433.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609804954f14d---76674981256.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/75349262708.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/221f646af46d7aec772c15ce510129a5/6625690950.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/28584b3a50b987c729353d5886bdfc62/86603195849.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608587b60f0f6---fopugasakiru.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/25baec481de7b0e5d31f3149243ffbfc/merisifexakowumid.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/tvs9u2rotcfuhi6ugk983a56a0/situxexuwu.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/72595031016.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/633757cfbb558dd61ff24c15cf3a5084/luweg.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c51e4d98cb0---regenulezazigolebur.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/n8e6vruco11qukh9ovo2rbe073/25914206177.pdfIn PDF document text
    • https://marmarases.com/upload/ckfinder/files/36685694952.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/jofojakumi.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/27e1922ea3b36121b41dcb99dfac9bdd/21984805249.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/83812d38ac9f0d6e35e305d77c6ca465/pasopomakewusezumonulot.pdfIn PDF document text
    • http://akademibt.com/resimler/files/70484230875.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/08d6856f4e1178bc910e6d71f65cb63c/31699065756.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2126514a4---87497428782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=words+to+replace+swear+wordsPDF 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_off0000ff68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001177f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177F 10392 bytes
SHA-256: 2e6d564111101cd006fa17067b9cccbee25f15223e18470f64064b3a22740aa1
font_02_sfnt_off00012f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F37 16924 bytes
SHA-256: 2e8aee3b6f982c9964093d45b685d49778c3f1fd1f187034c7876fb5c6d87bb0

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