Malicious PDF — malware analysis report

Static analysis result for SHA-256 c028d9d59be73358…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 22:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 986631a3e2e754bcacedfb1147af5d64 SHA-1: 22cdeeaa9793e447ccfd478503b15a5f1b65088a SHA-256: c028d9d59be733584048b36f312118fc344383711b6784a943398feb12d71f21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://specimport.by/files/files/fologomenelo.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/98958929239.pdfIn PDF document text
    • https://masihpt1.com/contents//files/94914608022.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c05c98b0175---96325300189.pdfIn PDF document text
    • https://brs.jo/userfiles/files/bekidovodubaw.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79fde037a---4049034568.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/342c7858d4d361f1f5482ef3b9d87007/89007579451.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/lowibokabokotidoge.pdfIn PDF document text
    • https://airxps.com/userfiles/files/81815832381.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/bisedofuxuvisovetape.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7ebe77edff8f1046829352613fce98d2/95370629978.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/jigojexuvuletab.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607092f0b7a25---fudogim.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4076b471b69dc19ca98b81513a76d66d/4547042151.pdfIn PDF document text
    • http://hanarotalk.com/userfiles/file///fukaraxulowamoz.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/86574408935.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/23783582921.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3ff8a4b7---fasufulexasovakuluto.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f634d24d051bdbd24b53921ae88f44fb/81763934695.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/wexuxesesezupewa.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210823092849.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/ruwixunotimapi.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/99790825203.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m0eisr835paqncr2lef742efa6/25420950436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=graco+car+seat+manual+snugride+35PDF 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_off0000e78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78E 18948 bytes
SHA-256: 14d8a47167974cfccc7bb41ff65713f4874355c3be15fca476b419b1ee25617a
font_01_sfnt_off000118cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130E3 11156 bytes
SHA-256: 3917fded65d18464483d427df082e588f36590d83eb5c423d52b2ab0661f4337

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