Malicious PDF — malware analysis report

Static analysis result for SHA-256 49893b289f7e581a…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 04:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d11293da900973e5412dcb1cac60d04 SHA-1: e122a973aa47f2c9b69f02ee015d19e98cd9af06 SHA-256: 49893b289f7e581aa4e2309d589347f55a3cdcc5c6f69b0d56638d4e3f8f6b22
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The file's structure suggests it's designed to lure users into clicking links that lead to potentially harmful content or further infection vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://thankschicken.com/uploads/files/zizoleximobune.pdf In PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16081b0ffc9bdb---gevexudexosig.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36c3165c3d---jifotugobojujitoz.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/cf905dd37dd21a5e45b747a07ab36bdd/fadaxapuwafiwaze.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/54188882865.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9cadafeac---bededubazaxululopuninoma.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/nubalufonopumuwo.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/dugasuvomutogozuf.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/varenikuzagadogusu.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/fepowinow.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e5be8b800---roren.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/sofuwumabefipekemunojed.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a7932e2af6c---50121070449.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/palakusonuxijiziz.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58703275056.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/61973103449.pdfIn PDF document text
    • http://m2m2design.com/userfiles/vuzefinumokarodagoj.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf2ac2a66---23264167984.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/eb3bea12fb6a0097a1e0f8481827a54b/satifowoxa.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/35425505177.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/cf26de70cd3ecf4deeb8d3990a861dc5/39053332479.pdfIn PDF document text
    • https://makanbanyak.net/contents//files/dekumajafupaxutasa.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7df8be7c47c8272584c430c2b0d45ca/fonaporizoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=position+of+adverbsPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/046e842213bedadda60b1a3861f6c0bf/jakotu.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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 17412 bytes
SHA-256: 47af5c40ffae13392caaf0da3a7568d484e4328adcdddc88fedef7529859d9b9
font_01_sfnt_off00011656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11656 10508 bytes
SHA-256: c334fc16772e4adde602f22bc8869381bed6cd639d1f36eb756717aabe2abb27
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1