Malicious PDF — malware analysis report

Static analysis result for SHA-256 d148ec9098e81aed…

MALICIOUS

PDF

73.1 KB Created: 2021-08-12 04:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f8618afc5b27215d8e58d0719d28149c SHA-1: f93b3fcc467599fb1375f12e91364f3c9b3f0b39 SHA-256: d148ec9098e81aeda8c3707097cce7ba0e9ec5408edbfb4ccbf43cd78b90fd00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=what+is+electrolysis+acidulated+water PDF link annotation
    • https://spacio.hk/attachment/file/lefogokexevivasa.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/62dfb4e02ddf00160b942978769870ad/57025559839.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/15624c0b50e5f9955735589ec85e1d88/41783746241.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/33906834038.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/rejukosijizit.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/fetop.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/14081600792.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/55362795168.pdfIn PDF document text
    • http://hasicimosnov.cz/foto/Image/file/nawawijesurejivafodatuson.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/gesinegiv.pdfIn PDF document text
    • http://vhshf.de/File/xowujeroj.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/kphd402qnt13ku49cgog9dqs5s/15589897822.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9fb6c3841---divegarepagulolekize.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609272da8193b---bomanudizib.pdfIn PDF document text
    • http://industrialdevices.in/uploads/14684495738.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160ba28b430392---zepeg.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6aeaa33e1---8045870313.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/dutijagowezab.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/tatiwumulitagofoxebedul.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080bbaca04de---71323690599.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f57db4d49a9---kisanisa.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/f5402df674f8c9c4ee602a825e09d652/jidinarigemafijupavu.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/dijuzivilamarekilidorido.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_off0000bd4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD565 10656 bytes
SHA-256: 7db04487cebf0739009b9e32b701ec995bd0db5f475da0ac1e9354a5faced56c
font_02_sfnt_off0000ee05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE05 16064 bytes
SHA-256: 281ec772067101647e364a73c4c0010c5c84bbf941bc9ed07c30face9398fdf9

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