Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7115b24cca1d78e…

MALICIOUS

PDF

85.3 KB Created: 2021-07-17 12:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f57cc495a5cb42b88c8cd2efd7e99a38 SHA-1: e05dcf6b7e4a34c54fc6e7af7243d976d4ae01f2 SHA-256: e7115b24cca1d78e2f439f2e1d8788ee98e6ac34eaafd635454997564e8bafcd
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which appear to be compromised or hosted on disposable infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis point to a common tactic of using link farms to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://brainbond.ro/userfiles/file/3446604495.pdf In PDF document text
    • https://limpiezasinasel.com/userfiles/files/wixasenawalatim.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/99720384918.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/b4291e3f0ec8eb60270679bc721f4f23/59003226174.pdfIn PDF document text
    • http://texmet.pl/userimages/file/waripenakajewenugidiko.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/56270170261.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/421568e7432f9604f453f24fd7dbbbcc/vidoj.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/3365f36ce356292f92786d019e479359/maxipikubelok.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d20e1ef1688---94876421884.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/jojovir.pdfIn PDF document text
    • https://hardlineconstruct.ro/app/webroot/files/userfiles/files/17781414036.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af60203dfb---38249474697.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/mokaxu.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/nosolipomabezamilogobav.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adb5625fd2b---88355439260.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae66f76a367---ruzafiwoxo.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/llke8m3vad2i501ebimnhkj8f3/gapakonemimada.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/fabamumelul.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779ad3d9ebd---gedekuradabedozi.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087628fa999f---46253100862.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gosixodobuzulidokemava.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/7922608dc3084161977fcdc002cf9b19/29153344926.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/32155705338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=cost+of+first+class+stamp+2021PDF 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_off0000ea34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA34 10728 bytes
SHA-256: 74e9495b054c1abe59b601a342194086d587ce17f1a495850dc1e7505b9f4c40
font_01_sfnt_off000102fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 17264 bytes
SHA-256: fc97c5bb310282ff145b3f0d3383236dc032772ad251e339aac4be30cb1fe82e

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