Malicious PDF — malware analysis report

Static analysis result for SHA-256 842296c26a5bc08a…

MALICIOUS

PDF

81.4 KB Created: 2021-09-17 10:52:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3edc56a52bf67f672552722941eb9422 SHA-1: ad6295ccd06e96ff53714c43db18249df05573af SHA-256: 842296c26a5bc08ade629169f86caf6bd7b929a1bec7350542b42d835efecf0d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mmrh.myagenda.cz/pictures/editor/files/82914625569.pdf In PDF document text
    • http://hzbmsj.net/images/upload/File/51001310714.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/kekutorazabadasoxab.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vugisarexonoxefasiguxiri.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143cab9e4db8---48471079201.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/jeniwibivigizavugapifo.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f5983f294---37696579513.pdfIn PDF document text
    • http://dfanchem.com/upload/files/12139576140.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/54866524273.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/segogola.pdfIn PDF document text
    • https://ms01bet.net/contents/files/43443982323.pdfIn PDF document text
    • http://czminghe.com/upload/files/lalawegetugituxisopud.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/kufikivugitagimuref.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7ee84c04---wadagagimuvotifotesikuja.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/55629819179.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7ed781bcf---zaxonevul.pdfIn PDF document text
    • http://fruitsad.pl/images/file/67337029402.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/losawufevazudukunub.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/81040882765.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/68376606032.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4bb3edaf4c8766d2f142ffce15c27547/33619152160.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/7773060109.pdfIn PDF document text
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/18357551387.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/valubej.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18625422084.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=pixel+racer+modPDF 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_off0000dc45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 17416 bytes
SHA-256: 712d2292be56c90bc77a980cc0319971a515da7163b6f5de306577bf2522efac
font_02_sfnt_off000120f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F4 10264 bytes
SHA-256: 2a17a0040ce6c0795f8dcd44aef9644ac81e2815a1a8c2c95a166539e001d2b6

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