Malicious PDF — malware analysis report

Static analysis result for SHA-256 787ad441f804bcd6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 08:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a69e14445f4c350567603b12a16325cf SHA-1: 287dc253498a808d0c93ab20768e9ebe6708577e SHA-256: 787ad441f804bcd633d853f4a034b411041c3f7c10f2250fb81945bd680c2e2e
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains a large number of embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution campaign. The presence of a link farm with UTM parameters further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://allytemp.ru/uplcv?utm_term=1+million+robux+for+free PDF link annotation
    • http://krakowska98.com/zdjecia/fck/file/roxemuzo.pdfIn PDF document text
    • http://fygl.net/uploads/file/020055425787.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/xejapitujixul.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/vinapek.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/59428568306.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091108192533.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/480969fb219a88e5267f524c55ab17f0/11565987279.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/moduwipunuvobofavoruweg.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3168891ae31a03a661810d32f09a7bb5/zukutegexix.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/foxiduxo.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/boxoniwodagopugerosa.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/xerikut.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/56578981834.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210905_9C5209D2F0AF6132.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/72051514673.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090618172219.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/72237139227.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__613A02C0C63CE.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392b45ec4c3---68059886464.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/78070618140.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/76279664265.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/gatababomofiletolagaj.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/kemokojetewidada.pdfIn PDF document text
    • http://mestav.sk/uploaded_images/file/lisefit.pdfIn PDF document text
    • http://creationart.hu/files/file/fesigapuku.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/61010348506.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/73620901717.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_off0000e623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE623 10244 bytes
SHA-256: ef397b0e5fa91f2e9625df139e9c6e4a85c0ef1162adc4fac6e64d1e2dded6b8
font_01_sfnt_off0000fd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001151f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151F 17112 bytes
SHA-256: 90f2a0f0e204869c0a51359b687eac0d29f2e2c8268e634b0981f3c4f36ead34

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