Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb0fc926b5ddb19…

MALICIOUS

PDF

90.4 KB Created: 2021-08-14 00:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a7e6a0d756bfd0ece1d05190fe7091fd SHA-1: 4d0c24e099aea8b6546bad7de69b28af4a0256a0 SHA-256: ddb0fc926b5ddb190af0637582aeaccbf52ffd13abec04da88f2faaeffdcf4b1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as these rules detect patterns commonly used for SEO poisoning and hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=hunger+games+chapter+13-14+summary PDF link annotation
    • http://cambresisemploi.fr/ckfinder/userfiles/files/81955034362.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/50840547228.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/43240915717.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4db726063---38975051296.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/fetal.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098931a69b5d---konowopujuzidav.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ae142bbc92cba73e6e30aaf2e7d3492b/25597891418.pdfIn PDF document text
    • https://webmenuplus.com/images/file/54909275478.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdef9f7408b---risavitutiviwexejut.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160ee23c96b987---bajatojepolamibo.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607144b08615c---lilodedinufok.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca1c79373bc---bibofozimujunumadunute.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b1c92b8e---ratilumijaloxuwoxuzugej.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lojanoserazidodep.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/1720793998.pdfIn PDF document text
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/vajusesipibiker.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/moriwezimed.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/svgj4jip6kk8a8e7isal08ris5/62705959817.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/fatepekenedudowul.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/gujuwukoxof.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/7j05ags38isqm8kgc3f5jv4c22/kebewete.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/97a8ecc297775735b5b086a513da5e6a/11830420795.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/luwewadawopokenofamekesu.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/zevilorubetibupetune.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_off0000ff4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4D 15908 bytes
SHA-256: 81a7359dbf99a629a6eac9f288a04830837da96565d09ed9264b36dcd4941188
font_01_sfnt_off00012825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001403c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403C 11104 bytes
SHA-256: 1e07e414b406907e4901d2b4f16df801f3210d8c12991f2d323ed5cd8286df05

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