Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac0cb6c3464400d…

MALICIOUS

PDF

97.9 KB Created: 2021-07-01 22:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2df9885592d46c8edee17592e570dd34 SHA-1: cbf16a7a97c08ee67e2589a9eae2df32d4fd1b67 SHA-256: 3ac0cb6c3464400d167fe5107afee81ffb62424315913d84f0d8e9d25e5a1c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the detection results point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=skyrim+console+commands+add+skill+points PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8000aa5f7034689b7b24cb8556da87bb/dozan.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/9929685168.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/sg0pnr2odnqfa11d0nhlobehq4/54223124398.pdfIn PDF document text
    • http://erex.hu/upload/file/34549486633.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210529222311101.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ad86188---mimaguxi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ek9jp7eqc6q80l7qkdrhs0e1b/fumasofosufefef.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9be3fa0135865962997235ef44745b02/gajipazane.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90547100485.pdfIn PDF document text
    • http://temple.mo/userfiles/file/polabidu.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081439ebe1b7---tuzevovipe.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/26f52ce73ad22cefbf24e79697c04df2/62700771067.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/2873128652.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/fewixikuzibomubu.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4b51a302ad1860af987af76e674aa9ad/kebesudofijokiv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b079cf62fe8---sufobedu.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/voxikejukibafamo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beeb2b700e4---84658083254.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cedb464ca7---52016430695.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/luloxatefora.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/58578328102.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16093c97c7b7b4---malitalalurinur.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47d6bc3a39---26883159899.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a21807e58---zudorepewutiwisinabawope.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/db8moq34mt1rta97hcqvu5j1h0/2205320961.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_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 10956 bytes
SHA-256: 5cd4dbc8691f9633007af19cdd15388b73b9a09a2c80b30afe870c824631ec1d
font_01_sfnt_off0001319d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319D 18024 bytes
SHA-256: 9bc29f7458707fabaef730f8ec1826760a176dec91673b7b9c806b88c393fb59
font_02_sfnt_off0001607e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1