Malicious PDF — malware analysis report

Static analysis result for SHA-256 54503620d44e5324…

MALICIOUS

PDF

72.4 KB Created: 2021-09-04 12:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 46beccbf2ef50fe267f41512135cbb37 SHA-1: 01916ddcd6dfd988f9543b1a7e202c8ff3c2574d SHA-256: 54503620d44e5324c5b5e8aa6d4a71d8e2cbda6d2bbe0d9d9cb29a41b830b9df
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of these links strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f475e951c9---xujafibufegiwinezuxa.pdf In PDF document text
    • https://recrut.com/files/files/nukenezorowego.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/77284475489.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/05e4341c0dec9a04044a257a1f38a63d/20061129747.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/f816e43107f02614823e2fa11d72cbf6/12865476325.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ccb9f7c39e94f56a7f708866331dd720/xadufapimu.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/981sca4lr75ndrj0gbq3ngefu7/gizinutobaguxisefu.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/belafuxodebutepojagep.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fijijikozobopeduxer.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/88c67495d73bbc212d5722a17547431b/26669501549.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796dbb9112e---namepi.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210903081108.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/gutaj.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/vimolazaderidujimixopa.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/80269467815.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210825115708.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/56970331074.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adffe69e2b---56394627186.pdfIn PDF document text
    • http://islandpointfl.com/userimages/22276478350.pdfIn PDF document text
    • http://pk.mo/userfiles/file/nanejo.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/35b8f386f8d7baa296504f9d34cf456f/dofasafevewemi.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/89792295547.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/gimofanerof.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/2ce0abf0e93e22b656fb1042f3604397/sakojof.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7166023d5---79527852350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=zenith+digital+tv+converter+box+manualPDF 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_off0000b71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71E 16816 bytes
SHA-256: 945520ba030ec7349b0fdb1d5b603b1a525cc6d348d6db9908e15b9d14feb9c0
font_01_sfnt_off0000e278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8F 11020 bytes
SHA-256: 38f4ee6d61759cf7097f8c7715ed77f335852fa59ad1332bbf847dd7919cd4e6