Malicious PDF — malware analysis report

Static analysis result for SHA-256 a193d6a143b32454…

MALICIOUS

PDF

77.3 KB Created: 2021-09-04 10:08:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a12e59c8ae176c15750e176c8e81adfa SHA-1: b111e38d9307b6f9a870ded707f5f8d7e898a62a SHA-256: a193d6a143b324542c3ec8166cebadefac4a315b7dc24a183a5ad205e05e18a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads, suggesting an attempt to distribute phishing content or further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=formwork+for+slab+pdf PDF link annotation
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610a67a2c1236---gedumuba.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/wiluwita.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kojezijiwigozidezar.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/68430786590.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711bef285e7---fesub.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xazoruzaguw.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/acb9cc799e0eae20cb01105083555f95/48789657075.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/kbdjag8ljn13399v7o0ppgp468/97143588362.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/tajuzixepakeduxitebage.pdfIn PDF document text
    • http://fkhd.cz/data/img/koxilarosewitagidesix.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/pazakurexefosajub.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/66094510866.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/gabir.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/98c28844dfb9d8005c4b576eba3e2d4b/renanojigukuk.pdfIn PDF document text
    • http://digifast.cz/userfiles/duvinasuximirigelepo.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/65470998735.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/65268159503.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/27605006595.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc33049d3b---pudesusiv.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/75993340850.pdfIn PDF document text
    • http://dinhvi5s.com/images/newtech/files/mukitilevodefarozugilom.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_off0000ccd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 16884 bytes
SHA-256: 072e15a7ad017023b6dabb341bad68498ea88685e1691ea09a92c35d85a0fe89
font_02_sfnt_off0001106e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1106E 10528 bytes
SHA-256: 6a02ee4ab46f43d5d0b06c084e2d4ab120eecbd55ecc154b91542b2a661f0354

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