Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7137ae2a434afa6…

MALICIOUS

PDF

76.4 KB Created: 2021-09-18 08:46:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6414b89be87f9dc7c7d38634c918cbb9 SHA-1: bcaf98b4893e0f423f373900eb22c8db7cbc513c SHA-256: e7137ae2a434afa62c52a136579871050a7abc30ca1f0883c04798d473c6cfbf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a link farm pointing to multiple external URLs, some of which are hosted on potentially compromised websites, indicating a likely attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/86898119197.pdf In PDF document text
    • http://artgraf24.pl/userfiles/file/lilazofodanegizimeluwoli.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c06972ef9da30f6169d317f9fc2a7719/80440415454.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/23362850715.pdfIn PDF document text
    • http://makrostal.pl/user_images/file/54617382430.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/38890471280.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/sepagomovurezulezitidiw.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210912224742.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/xuridabanepitarakave.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/fepidapegu.pdfIn PDF document text
    • http://maksimetall.ru/files/9647340266.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/lanevetudupotomipebi.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/diburegivepivigarapu.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/57833402614.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613db2b4b26f3---76707836294.pdfIn PDF document text
    • http://henca.com/files/details/file/poxekakikepijowuteti.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/besaxefaxovanovovixar.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/pemejejunutab.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/q97q8j4hidb1ik5gs15inhaf80/sidibozefurazadodojivubap.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/67605759145.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1214a18da23b1ed29ec5ad918e2e76ae/wufudazepagasis.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/68552279634.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/18849664107.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/xojuxozaze.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/dogigezesugunisod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=print+to+file+pdfPDF 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_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 16172 bytes
SHA-256: e2dad05101d06ed1619765e5896efa2dd3143c6f04892bc5cf3eafe0cb6b031a
font_01_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D26 10160 bytes
SHA-256: 523571534727dabe46ac9ddc618b83d5310cf486054b0aaedd2048a29abb0ba6

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