Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6316e6026a031b…

MALICIOUS

PDF

70.6 KB Created: 2021-09-29 05:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cfa36d319196ce010a70ea3ac82e7cc SHA-1: c35ca8640d0a98e728f255b1d0dcf1e16c26cc04 SHA-256: cf6316e6026a031b3f5d5213253dc7e67aacb6232021dac99ad54bc496729e0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://doubler-son-capital.com/photos/files/liposovedorilogelonir.pdf
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/83478278486.pdf
    • https://marwaautorepair.com/nbloom/fckuploads/file/94768645570.pdf
    • http://yonezawanet.jp/units/24250/zcycom/files/xapes.pdf
    • http://hrzservices.com/uploadfiles/file/83206929726.pdf
    • http://abpjse.news-read.com/upload/files/46673430231.pdf
    • http://bjerkelunden.org/content/files/userfiles/file///84040025510.pdf
    • https://uclerbaklava.com/resources/file/21606440409.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/giwabiwosirekilagos.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fazolerem.pdf
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/soxefonumosed.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_12_04_13_07_1360.pdf
    • http://pokrowce-ochronne.pl/Upload/file/51870150049.pdf
    • http://paraglider24.de/pics/fotos/1/file/riwipevipefibur.pdf
    • http://barcelonasixtytwo.com/userfiles/file/monobara.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141394b11dac---wobalulepowinew.pdf
    • https://simorgh.it/uploads/file/tuwuwisapigijosefilewilos.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305d6838b7d---16017810124.pdf
    • http://www.frank-diagn.hu/userfiles/files/wigasubiziv.pdf
    • http://madmojo.com/fckupload/file/83551057947.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/1395492270.pdf
    • https://tessuno.com/upload/files/61486f5cc8e0a.pdf
    • http://thamcohoaian.com/webroot/img/files/lasamavupaloxumo.pdf
    • http://chiangmai-clean.com/user_img/files/lugutegerekuvosiwozuf.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d667810ac2edd718f115a7e43b05a300/lojowanafa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=euphoria+season+1+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1dc.bin
ad74c8b11a3c158020e60ffdcd3c0d33c1bec231ae4039dcfb8dba6bc76e9194
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DC 10444 bytes
font_01_sfnt_off0000c981.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC981 16792 bytes
font_02_sfnt_off0000e193.bin
9c358670b08d9dae1bc0351761fbccceb5eae58c0912a6125a27c33eb1adfd4b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE193 16372 bytes