Malicious PDF — malware analysis report

Static analysis result for SHA-256 e777e46bc8002ce3…

MALICIOUS

PDF

84.7 KB Created: 2021-09-21 07:32:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f36db7e83fed2f7947cbb4b7120db32 SHA-1: c811166479e515fdab5135690e4144b2804a932d SHA-256: e777e46bc8002ce39da6dd601d8fef81b0d7e2ff1c5b11ef68899e061841d32e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised WordPress sites or are part of a link farm strategy. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to external, potentially malicious, websites.

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 https://archism.ru/uplcv?utm_term=small+mb+games+download PDF link annotation
    • https://accesoriosalmayor.com/images/userfiles/file/78655148028.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/28338895001.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145867e33230---vijuvevu.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/dozuxoguvivevu.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/39835412475.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/327551345.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/80625485450.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/08/nunenubovego.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/66005395781.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/7148b12b89f1bdf50c183e80209624bd/30098246071.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/81721190750.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/5256726522.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/71584478054.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/wigetar.pdfIn PDF document text
    • http://pm-property.pl/userfiles/file/71588081905.pdfIn PDF document text
    • http://venkateshservices.com/uploads/35532900160.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/15023698636.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/nezaz.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/26245391096.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/40395470656.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/jodidewupir.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614504492eb05---54100771971.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/55954848225.pdfIn PDF document text
    • http://goldmustang.ru/files/files/65876647035.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///91198675769.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_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17924 bytes
SHA-256: a4b2520a72c0285450ea781e5a33eae77db91c89be3a4e3697d2dedb8c72f3aa
font_01_sfnt_off00011556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11556 10604 bytes
SHA-256: 48d85d428fcfa2e2bcc79ae4ae54d2ac4e79a737bbe00f536245a8277799caf0
font_02_sfnt_off00012d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1