Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d76cb2449614377…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 07:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 51e737746a7e6022d62d38a3a79e00ac SHA-1: 82476648efce90468fdbbe6372a6cde5ec0bab11 SHA-256: 0d76cb244961437771a366343b5492ebe62997666e2a083c5d9acbed8f3c1407
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://cesishotel.lv/res/wysiwyg/file/29018267037.pdf In PDF document text
    • http://studioaeditecne.it/userfiles/file/kalofafejumeputagop.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/c830d71492791b3857363ad93434d5aa/misulojado.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/komirelefipu.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/pivopelo.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/binari.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/43795223926.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0defa9237---remiwoboxinotixasuvera.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607379f1b468c---30299025635.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf93c37aba---8551502010.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/lubepanizolarerukuxub.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/23903741850.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/5d1d07c0f7f8f6e50f371393705db13f/89935670729.pdfIn PDF document text
    • http://prosquash.by/data/zuvusigivixiwobanuxilewok.pdfIn PDF document text
    • https://nepalaviationmuseum.com/userfiles/files/82796514051.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/dutewinibexarel.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/kisukenov.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6aa33c8a3---tinaduluze.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceea7b50f---15887376017.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070b3382c60c---36367208009.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/53226930842.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/gujuwamumajorudonojarijef.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/53280967092.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/72340192934.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cf7d69c6375cefc0e866de8d3851ea98/neponuzozaduzuw.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/63675840256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=determine+if+even+odd+or+neitherPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 18368 bytes
SHA-256: b77244a8214f190d4851950c367171548fac6d9907ea5f89e81ca4f7cb7a18e3
font_01_sfnt_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_02_sfnt_off000113d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D7 10312 bytes
SHA-256: b8460747924a31fc2ef9c4b0fa015b71684b03a8a1f6d59cbdc76f9683c9862c
font_03_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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