Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ac45f9d3aec00c1…

MALICIOUS

PDF

76.3 KB Created: 2021-09-08 15:08:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0eaf18ceb21bf917deda102be19f675c SHA-1: 64e16a35ba14d384b1167d309b91d14a23dc71f3 SHA-256: 8ac45f9d3aec00c174b7819c61c9ea427eb200caceb7c5b871247ff030c19290
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 or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://wonwon.taipei/photo/file/49366718788.pdf
    • http://biirbeh.mn/images/content/file/lefiwi.pdf
    • https://www.oalysa.cz/ckfinder/userfiles/files/guvafenipoworilela.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3f817b1b9---60632162027.pdf
    • http://polyalpan.hu/_user/file/23755166833.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161382892e6a60---fuzixoj.pdf
    • http://biondiairsystem.it/userfiles/files/pewavarej.pdf
    • http://ing-ka.com/user_img/file/84958770177.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/9283292009.pdf
    • https://hotnewsmd.deca.md/upload/userfiles/files/14959046440.pdf
    • http://allasclub.com/campannas/file/6202221816.pdf
    • https://bestofbucerias.com/upload/file/pobad.pdf
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/welitukatasebizolupisa.pdf
    • https://gifarlcm.com/upfiles/editor/files/42038813349.pdf
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/20138412631.pdf
    • http://yarpb.ru/pic/userfile/gunibezagapopakuwederivef.pdf
    • http://radtel-sport.pl/userfiles/file/59625643158.pdf
    • http://azstorestudio.com/uploads/files/19315672798.pdf
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/60643344868.pdf
    • http://businessvaluationapp.com/fck_files/file/fetaxivitiw.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/717db9101d7dde91aeb9de36baeb793d/pidolimufuvanu.pdf
    • http://indianspringhomes.net/userfiles/files/17053025739.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc0f026528---kutunopolowinipewet.pdf
    • http://vincentianssjp.com/userfiles/file/sisetafafeluroxobakivup.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16137e88e47692---86661725880.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=dalf+c1+c2+100+reussite+pdf
    • 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_off0000bb51.bin
acd308d172d32a960a869c7d42a028bf62db3c4b24ad9294e8fde7fb75ca7246
pdf-font-stream PDF embedded font (sfnt) at offset 0xBB51 21004 bytes
font_01_sfnt_off0000f2a7.bin
8bade6a60661490b37795d49dcf736b7afc55ec3044f71d5b7b658d1ed1d5e74
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A7 10784 bytes
font_02_sfnt_off00010bc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 16792 bytes