Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c522dc7d6e8c84…

MALICIOUS

PDF

75.7 KB Created: 2021-09-27 03:37:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cc21cdbc48142d4f8df65019ee1bdf21 SHA-1: 2ed40a5c2a260cb7ea3cd1d5360257fe3a365527 SHA-256: c1c522dc7d6e8c84b23daf6cd8c62cdb823132c9a718198c0658cc98b26168af
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the primary function is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=app+hider+notepad PDF link annotation
    • http://menifee.hanasushichoice.com/uploads/files/sokes.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614ff1aaebe87---82003557709.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/nigafedop.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210924/file/57643544453.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/90274887.pdfIn PDF document text
    • http://zzquansu.cn/d/files/16831509936.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/bakonilejot.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/vawuzu.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/fumiwewugivivukorivux.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/5041461471.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b42f622a09---lafemin.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fffb82b569---juxogenosototukoxukijaka.pdfIn PDF document text
    • http://chemicalengineers.ie/images/rasosowo.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/lapifetawerikimajil.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/jamubimibupivujitiwu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/38c0f272216ddd2c4b6c6f8f0b868e8f/56075392861.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/97496199970.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/dagapibiwezakupo.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354e6767624---kififa.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/68129914621.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/16414264324.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/vakipijukifipaf.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/89285502591.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/60000121505.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB358 15500 bytes
SHA-256: aa0895f8ea60f79d43edbd46fa963125b07996a1a9335acd9ccd14801aca8cce
font_01_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10256 bytes
SHA-256: 1325bdb00a4c284893831207405356d60983829578a23428b326a19e5375c4bd
font_03_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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