Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5321e16ade8da6…

MALICIOUS

PDF

102.5 KB Created: 2021-08-26 05:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1771ffd8ead06f4f61f1df668fd1e251 SHA-1: 02bd81c95c31df7d0b76a91f90614e2daff697ac SHA-256: 5a5321e16ade8da642378ccfe4d3859cb71390b5853654f5a742d634b4b3ac4d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards the document being used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2e97631fc---kozodopivogoderedikubezo.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/89447330486.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098372df11f1---60007610526.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/4914150819.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/59307747065.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/panugelepixuzesasotovox.pdfIn PDF document text
    • http://popeyebio.com/upload/files/92395266122.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/13900155671.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1625518300.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ca5c3ba0a---dobagaropelil.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/pererukixelopake.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ms13quf1sav3v9up4t2uqgo9m6/rirujagusekobusetidu.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/kesalazutorakebep.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f1903cc6e---40007589068.pdfIn PDF document text
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/33215202074.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/8ba611ac743013b27ccc0eef20038f7f/zufowisaputiv.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dbebc088d4---mufimogatomelufulesinizuj.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/tidonesukinaxotad.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a33c7373d---61241008529.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/17ddbccc1686b752e9980ba14b22bb79/71201787216.pdfIn PDF document text
    • http://zlato-invest.cz/upload/files/55122472000.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607145a70128e---jetezorabisebi.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210801194348_1knnrn.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab191ee078---pitutigovika.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f1a56c8525---6497653364.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/16055436327.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/7287efec960877b4ef1283bbdb3d0bfb/sawasorarir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=question+and+answer+dialoguePDF 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_off0001305b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 10668 bytes
SHA-256: 1bfc90415080dcf556496a7f3e789562f3f33bdf892704fd226a862c6806224d
font_01_sfnt_off000148e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000160fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FA 16436 bytes
SHA-256: 1e9712ab642e546b5b06f7090d702c708a0ad8935b229de8a9b41e8ab7f1977c

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