Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07fa1df4666a361…

MALICIOUS

PDF

82.7 KB Created: 2021-09-19 09:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb2f5c1055e58913dab4cc36ec0df6e5 SHA-1: 7f36ae427920fa7d06ff3820fb910c8cd9643ef7 SHA-256: a07fa1df4666a361a42cae21d72ed057f965aeedda2e9e461cda5ce8ac427c8d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614566dd4dd55---19871191983.pdf In PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e34d5200b---wiliselemotoborakujewed.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/e576a35b04f818ba654e019a5dec46ad/28413779262.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/57523386258.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/66503415301.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/71729286238.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/72193740121.pdfIn PDF document text
    • http://oilspecchem.com/files/4773009989.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/89450619797.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/57566211296.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613747c2d0ed6---57688573611.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/zujimubemigixudon.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142533332724---jajogexowubup.pdfIn PDF document text
    • https://abhrian.com/userfiles/files/vutakira.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/sizasoxoxatageli.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/67192927449.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/zaxon.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/24787092703.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/18306935108.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907022127657053.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/92256608215.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/pabomubokinuxadajerisovu.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/43845079235.pdfIn PDF document text
    • http://ridendo.cz/files/file/nomonavuvalo.pdfIn PDF document text
    • http://highlevel.pl/userfiles/file/sewagigitesawepelumiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=analytical+geometry+questions+and+answers+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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 11392 bytes
SHA-256: 1f85c10765dd7746581249297852fea04f46bdea3de2def5baea9610b68022c2
font_02_sfnt_off00010df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF5 18160 bytes
SHA-256: 318cd6e949c74fbb25bba66efcd887d748c7998c9f354472727a88ca07dea6ea