Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1ec9b17f89e23ff…

MALICIOUS

PDF

119.9 KB Created: 2021-08-05 04:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 629fa3695e06187bab72474f720db86e SHA-1: 6e1e7db0b1ba661fe09152ad194b97428b0964b3 SHA-256: b1ec9b17f89e23ff62d201c3df1a9a3f7bc0481c98c107150e03bd472b42ad92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=driverpack+solution+2016+offline+download+getintopc PDF link annotation
    • http://baigeleather.com/userfiles/file/57347163188.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/nupakamikidubemer.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/javasuvewuwixuxuwedoni.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/54314231324.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/jovawupuwizilupaluxi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbd484fee3---zevenadokitubipikufasix.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/e3b423bf09300023571e2bcd5ec9427a/70550014716.pdfIn PDF document text
    • https://madopin.com/calisma2/files/uploads/luritojesedenevir.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/fibevixaj.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/35577464656.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b3ea31cc---dipebolurakitaxirokugasem.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/81976022772.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/47414778421.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/899370fbf6418c72c2cb47817078b1e8/buzex.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/97928436245.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/dapepefabamuninowijagowe.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/c793a6bc5ba54db5461c51985f7138f1/jabuxogek.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/07nkdrhjh9pti4qp4acrkjp70r/zezodisuzuzomuzovo.pdfIn PDF document text
    • http://podushka.by/files/files/makemitadux.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc49773d86---51497661107.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb51757159---38080777716.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/47082478271.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20218565997964.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_off00016881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16881 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18098 11600 bytes
SHA-256: cb7215ede39a720c7eb6a597fd5837b931a54d74f390c762a4851529b5f1f70f
font_02_sfnt_off00019c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19C42 20408 bytes
SHA-256: d94123199b2ced816f0f45a1bb83456560e49ad8334ada87a30d677a51fe15c6

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