Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f41ab0a20359594…

MALICIOUS

PDF

94.8 KB Created: 2021-08-13 21:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 322a242d9412a7965bb319c693a4d03b SHA-1: 0924b69e544cbc6574e2749323ff0ddc6703194c SHA-256: 1f41ab0a20359594a69f8709d11e759ff9b158caf6d0d4889301bcc570c6d59c
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://sport-way.ru/img/file/zenuxuzu.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/786fdb6bbb92716685106c1317c9502f/bovopoxigeneketegax.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/b23dab420c418842822b49f217d0918d/18942978572.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e5893dbc9dc---75386335579.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920d7296036---89969883906.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/775bb541a5406eb57b1468ed06b2a097/mogaz.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f371245a2f---tebuj.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/gozuvejifipumutujulizozo.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/jikoteziv.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/34249427762.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/mifozerafumavasegopuvawis.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/84763685463.pdfIn PDF document text
    • http://xn--nellieskche-0hb.de/userfiles/file/texudiwupuv.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/nqubkgs0e9jn5j5elr7embhs7a/19191006156.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70484216785.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/gq2kkqpo5pmq0l58bjje8uh9ds/78123398774.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/0ef3aa25816f2ba67322b6f690efc233/14100315087.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ff0acb1101e---wumopafatapisuladafa.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/qtlecfmge4ffvdvdr6c6kvi9m7/gixituromuzipakavijud.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da7a9849e26---6561595370.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/19680402415.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/23104525535.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/95996945412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=exerc%C3%ADcios+sobre+reg%C3%AAncia+verbal+com+gabarito+9o+anoPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 18968 bytes
SHA-256: 65bbd30171f9b33eebd3919b18d8e943ec1f244b88df71fe9a80a8cd65d7f527
font_01_sfnt_off00012116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001392d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1392D 11252 bytes
SHA-256: 569ddab7b5a63422c4ade54e6f76ef8feac51596b0e4fbb3aefd5329a5fe26e7
font_03_sfnt_off00015355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15355 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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