Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d01a13dc79f27eb…

MALICIOUS

PDF

79.7 KB Created: 2021-09-07 01:57:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b63324f30949efde9a479279df0db9c1 SHA-1: 4d365b6436b0ff21db9e2aeeb3512a4d8e4e03d4 SHA-256: 1d01a13dc79f27ebb8504c6bfa36c770f8a552d4ddb32520f21b642a3df99476
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to various compromised websites, likely intended to trick users into downloading further malicious content. Although no scripts were explicitly extracted, the presence of numerous URLs on compromised CMS uploads suggests an attempt to distribute malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160803f6b695bb---siwuxiw.pdf In PDF document text
    • https://kitchensofdiablo.com/upload/file/42443151109.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d7e717817---79589367346.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/rolozisibibamipoje.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/21315678091.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cffda5f2ae0---28129601997.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/68193750350.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/88917888828.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/mevenu.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/sabur.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7s36gsfn0343rrkokhoc8aojk4/42758848810.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280836252562.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ef839f166005e0873b525f5fa918f35c/popon.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/6821195159.pdfIn PDF document text
    • https://taperagi.com/contents/files/20377123450.pdfIn PDF document text
    • http://proxima-design.cz/files/file/livawufudarenivilotedosa.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/sejogibi.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/lifunufawebat.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/cf4bfb058a9e7fb40f6671a6dd636d37/pubewajawonisa.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/toxadimeratezax.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1af042077d---pivupejoje.pdfIn PDF document text
    • https://altbuket.ru/files/21552892189.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/lozawasamiwun.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/biwuva.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/68979007024.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/tobakubivilawidupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=head+first+javascript+programming+2014+pdf+downloadPDF 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_off0000d195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD195 16612 bytes
SHA-256: e21d81a82b9b791c8d5ca8539f45045cb6e092e5a8656dafaeb1aaf446b99f8d
font_01_sfnt_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 11608 bytes
SHA-256: 5c8e9fe6b84348de4034392cba70f380db03087f6597da4151ea9a06c91eb279
font_02_sfnt_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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