Malicious PDF — malware analysis report

Static analysis result for SHA-256 13e00049575dda82…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 06:20:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 5444f722f033300df19d9ab689d29674 SHA-1: 1f8d69ba21953a89470174aadbeea266885ec57b SHA-256: 13e00049575dda82db42c44a7e8c7ae3cc21acf91dffe3b6d522adf7abcfb1b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://catamma.ru/uplcv?utm_term=suzuki+dt85+service+manual+free+download PDF link annotation
    • http://sea-cruise.ru/ckfinder/userfiles/files/wafovaxubepizepubufoba.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/73595738736.pdfIn PDF document text
    • http://mobilni-kadernictvi.cz/files/file/saranudofowizaf.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fea271411---lafureluwibepigabubav.pdfIn PDF document text
    • http://budaors.varosom.hu/userfiles/files/213328714.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29e718c19a---lulokexuwakizebomodim.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/4bf67cde809d0f9cc43b4d502d7d2277/86178672854.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/dojewowopazusifosod.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/8396c756045647bd420db3d475e20f29/36992298192.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/53190196439.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/afhd1p06043embrrbs5ofugojj/56753585424.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/a262c4eb0471afb9c3d5960285526340/34297567741.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fd46f5638f646c6d847877cfd6f6c330/89145361783.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210613151854.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/wapagilifaxol.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacf80c11d---tagirivakikojobabuvabe.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888e0c4b4f3---23408702934.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/xelugijutewu.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/jeravufigo.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/1a7e5b7f543cbd522ba4d3d9762cf5fb/20764389041.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/bsmptmdfkvip063dotalf1ou0l/durubepelenasogujilije.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ei3vn8a1m6dd7usruqh37j8odd/19484321402.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/a1daad8274a6bd38a7d247ca02fb8b78/sejejituzobilaxub.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/qm06abkdukpmv8gh2qk667v456/budotufasibojupiv.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce6db233---87337267945.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/guvaregigipipisipil.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_off0000d9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CF 16784 bytes
SHA-256: 7a8a8a800ca600124dca42680d851889014e3720fbb205997b8d1705840d138e
font_01_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 11456 bytes
SHA-256: 7a2f2c5e7b4f792fbcd65ce63fe01bcf7e44d8e179af3e65a5c9e376bfd9db4c
font_02_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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