Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c58c43b0eefd6dc…

MALICIOUS

PDF

81.7 KB Created: 2021-08-19 03:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b41f774fade0a65cd9e53cb3194f8186 SHA-1: 5fbc35406cfe9101b5dc87b2b97b370dedc1041d SHA-256: 1c58c43b0eefd6dc9b2c2a5cb9eaf67daa2999c786e2367afcb1175039f08b1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs indicate a likely intent to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://synerhu.ru/uplcv?utm_term=what+is+the+rhyme+scheme+of+a+lyric+poem PDF link annotation
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/bisizesefazevafebarafoto.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c522b2189f2---27742554673.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/xesovulifu.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/46044432541.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/11262318506.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726ce06f532---nitizunupuludo.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e03f1f30b74---35234277473.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8a25d1bcccf7d5a52c7ff4174a154925/91408466358.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fasas.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/ruretebok.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/zulozazuraku.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecad19eb62---wevewibegaramivedefuxifi.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609849b5e883d---95461487034.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a77d3bf5ca892fba3ffd898aa677f494/dutowepibamodekepejejek.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/j7fvldrsao6jjl0hnj24mukbai/takazaduretilenupuwafikag.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/nonekuvajutor.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/merajubemajafaluremaxisa.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/49184240775.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/10826645893.pdfIn PDF document text
    • https://dm288.com/slicice/file/laboj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/c6dee3d7aaf5df685d79751016d2983b/71431473656.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e91a6a66---1745803340.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/688ee60e88c9923ce48148c2d4e7d564/29563960611.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 16672 bytes
SHA-256: 97fbf99634c80918ec421feb067717504f6f9bfd401e5419851f613241f64c6b
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 10748 bytes
SHA-256: a7a52efa5710e12bd75d9b93a4071883ac517e8bce59f471facb1a10ea83a0fc
font_02_sfnt_off000120bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.