Malicious PDF — malware analysis report

Static analysis result for SHA-256 43db2332e5a078c9…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 04:44:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 797c7e432f87ff6b775b7ec6490118a4 SHA-1: d0a7e3f87bcc9ba5184be7c8da19ffa7627894b1 SHA-256: 43db2332e5a078c9afcdb9e3ee1612bfe2f86bcc2a0030b84bd6a8aab6abddeb
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malicious content or engage in phishing. The primary attack pattern involves directing users to a network of compromised sites that host additional malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=itext+image+to+pdf+android PDF link annotation
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3cc0968f4---47893761126.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/bidavonudivipujovob.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/74342379588.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/q587iegak8nr2qknjqi54vb2nu/89162318146.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/td2fpmvaifft5t6gsa1is0523a/47350160283.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/jofuwuki.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/gevebe.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/xotowugit.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/4223954417.pdfIn PDF document text
    • http://polipack.ru/content/file/mogakekusipovufiwe.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/14404428783.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/69rmkkhqb4j0t8dglc4pat75c4/derosivinadudisuxaw.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/zijifemefevigowumogukige.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/vadimo.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6af4721e29---bunesebuwanelorin.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c964377e86d---xatal.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082cc9d3670b---pujilusegabulakozijaweku.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210729222243.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939efea17d3---94465842567.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/xifozijopalewor.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/88535062725.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/surugebigejoboke.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/40274785720.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_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 17860 bytes
SHA-256: 23d204226339f764a66236b7d85f6757eb673df876e315cdf35f3858bdb7c290
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 10680 bytes
SHA-256: f5e3917459571966afe44683a4d0f05b4eb86c8295b10fbcd280b34e3a17aa5b
font_02_sfnt_off00010a42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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