Malicious PDF — malware analysis report

Static analysis result for SHA-256 6467eb82d5dfc381…

MALICIOUS

PDF

84.4 KB Created: 2021-09-04 23:45:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 82ade870a6c33cc04ee048f1ddffbdf1 SHA-1: 63710a17206bb9342d595dc7a203535931ae6d5a SHA-256: 6467eb82d5dfc381415106d4f1117df915f9b5637bc40c87ad15e06f6f9eaccb
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a deliberate attempt to obscure the true destination or leverage compromised infrastructure. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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=informal+communication+in+organization+pdf PDF link annotation
    • http://ateliergermain.club/sites/default/files/file/3252036262.pdfIn PDF document text
    • https://shidoremicrosys.com/media/21517269943.pdfIn PDF document text
    • http://fedime.org/imagenes/38544041164.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ffb38db7---lixaloge.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/jolojet.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/4iv7v0ia1lq4vvdskgihmjt7i2/nuxagiresavedinuruzepun.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d0b234e11e---91902094106.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/newuxadafeduvokawukapuzid.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/80316359959.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/20826999480.pdfIn PDF document text
    • https://abyway.lv/images/ck_images/files/77930794100.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/48989771329.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/64907738287.pdfIn PDF document text
    • http://emeat.ru/var/files/kemozosolawadetenapulajo.pdfIn PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/fodamozopepewaxozam.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082b851b63a1---wowovezulakemopelezawife.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/kegetijilepabobosop.pdfIn PDF document text
    • https://atrax.hr/files/xepabo.pdfIn PDF document text
    • https://deitratech.com/userfiles/file/diwirafutafadinekedo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608318de3a2d9---81233000539.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/e43b9cd4ac9e706da5520c3655eee565/sajuzogufegokilukinukofop.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cd4e52ec786effc0063de13cf2be2629/57446802145.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/menokixi.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/ziwetojonivikarevu.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/52532626602.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_off0000e73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73B 17280 bytes
SHA-256: 8654593c5c85487d56bbfc91d84d8d1c3361def76271bbdcff8980cda97306d2
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 10776 bytes
SHA-256: 4b3755f3a5a8f4f4cef884b19c3bc681407c81bd2069b9c166a0d18ffacdf308
font_02_sfnt_off00012bf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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