Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3094e0a31107e6…

MALICIOUS

PDF

95.2 KB Created: 2021-06-29 08:42:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 29234af7a9ca60e68639de8562163311 SHA-1: dbdcec85e198d64de2c61ff71375629280b335c3 SHA-256: 8a3094e0a31107e6fad5ce0f9a51e7d93d8bb99fee9ecbf197f10ff169d4594d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbdfe89d5c---zitivulesone.pdf In PDF document text
    • http://travellightnepal.com/userfiles/file/devawivax.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1976375659609dada9dfc19.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2fccbb8e---87905730090.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/bapojojagilajojusukutide.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859d14267b---rilevosufafopukuwozepa.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/98b2b5848b00b467ade2f0653e7e3ba1/xurikudaputivifofufojojo.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/56402621652.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ae29b5acb---sivigusirakovizu.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/kadazuposedu.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/52902299502.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1e5721af0---14627410647.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e976cc7f03---tewejilerevitonovikakete.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1c0343ba0---zixowevam.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9d5a574c2---35222079447.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e11d85d15---63904416746.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/98607756991.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/febezofudure.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986f20a2448---wobuxapabadelo.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/94018926726.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160708e4221e08---semajiz.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216394478123.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b6ed4c99e---kibusubivisadegifedoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+clean+a+grandfather+clock+mechanismPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/da5547ffb4b98e8e604191553254d1e8/66950749406.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_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 16856 bytes
SHA-256: 88876ef841ed504b6045839f13a95a9e96196423090c28243e376b6da9d5d7bb
font_01_sfnt_off00013d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D8F 11092 bytes
SHA-256: 6b2a0fab2adc019be65c5ed4360874fdf32ba647f7f14dcc1c5eb1df67d753e9
font_02_sfnt_off0001570e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1570E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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