Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f0087e1a5f99266…

MALICIOUS

PDF

106.4 KB Created: 2021-08-26 02:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 740a67e6cbb93b2e9ec384b98a1b8e29 SHA-1: ad61224c15e66218f02a4e7ffc51084442b4081b SHA-256: 7f0087e1a5f992662f5147c31e2197643032d43fc1b368461ca794909912d0f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself is indicative of a link farm used for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://vresponse.net/userfiles/file/nofevuguxizobovukuregujax.pdf In PDF document text
    • http://escrima-rlp.de/userfiles/file/kifudonobitim.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/50795455336.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kli8ceee0to8vmdang2um4mb06/75275571326.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/12ef5e14505e2843faa5f16a0c99530d/wezavagapekewabewu.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a7d7d6d23---nujevapi.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/joregajomumumi.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/ab3185f39f9d24af16a07340c5e268af/pimulupimibazavebuluvi.pdfIn PDF document text
    • http://grandfiltr.com/files/file/zuxutojisagimaxorelukefix.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/lexigodurugejid.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/91623658446.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6dac693b64a64e09ee7d2331e1f3e779/43258166398.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf0c97aee---7202834462.pdfIn PDF document text
    • http://farmina.ru/uploads/files/ligasa.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/29753623783.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/51270582329.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47212453497.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/281905013533.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/zavasonikimagan.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/24841590257.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210703_C865019FC6E8BC38.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/wuxefozujiwutibeto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=functional+competency+meaningPDF 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_off00013c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C67 10640 bytes
SHA-256: 5bbd924d26f1b98f2e90bcd01f313c4b3c88391a1e5965600caaabf751ae1482
font_01_sfnt_off000154c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016cd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CD5 17884 bytes
SHA-256: dd3c3dd2e231b22cbc1cae6ad5d2f9225d9aeac3fcfe4e9c798284845cbed7f9