Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a1f11dfa661455…

MALICIOUS

PDF

86.8 KB Created: 2021-07-20 00:34:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d3258c5ef49d47386010a832625e6658 SHA-1: 996c1abe1a8067fcc4cbc12d26293a7d0537de6e SHA-256: c7a1f11dfa6614554dd5357ae225b90bf9d3f992b9434aa1d375adf8c18c3f50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final destination or distribute payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://alakharia.com/public_html/userfiles/file/86995730024.pdf In PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/62787467493.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/45533187202.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e053a6afee---sovegagamutu.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/25929433420.pdfIn PDF document text
    • http://csc0351.com/userfiles/file/20210704221006_bmv1ix.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/pevebez.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/35b45093ad75f4dade106531b85f7e15/65968133406.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/97baffaf1a6958cb40cee40adf2e806b/95067938639.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/kudag.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/xomumebiwasazinovino.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ef622ff16---61214404027.pdfIn PDF document text
    • https://robertbah.si/files/file/96413725719.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e198312e4bc---wovev.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/15df923fbb5d9f56467dc70d017cdc06/dibile.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/60367464833.pdfIn PDF document text
    • https://kede.org/userfiles/file/22975961863.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/tamewuxuvuvuloxabeva.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/1642558795.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fb35d3158---bonerikezil.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/3hgg3gnif5j7v9ccqolvb8pg8c/tagibadomovazagaji.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/75587202627.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/b0590ff303c6049ce17598a42f94516d/kumimamovit.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecb292727c---75772320440.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/luributa.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=star+wars+across+the+stars+pianoPDF link annotation
    • 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_off0000ed2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2F 10584 bytes
SHA-256: 28f462c94925126d4e253b4d15b031d0662d846113973bfa3139c78a64600110
font_01_sfnt_off00010557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10557 17720 bytes
SHA-256: 1403c95f15aa088f6fdfcc410c84ff0a1ef1282dc4e87a3648fff2336182b455
font_02_sfnt_off00013414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1