Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48c57f2d5d988b6…

MALICIOUS

PDF

78.0 KB Created: 2021-09-15 17:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29e10d98671590c532449e749b78d833 SHA-1: 04fc38905c846fac1458a1137fe87b1b2e538608 SHA-256: d48c57f2d5d988b6a0eb063c0832868880f917056f408acf6dbcec54d9581224
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of embedded JavaScript points to potential exploitation or redirection capabilities within the document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=redmi+note+8+global+version+call+recording PDF link annotation
    • https://manualismedicina.hu/fileok/file/lesozeg.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109050523436011.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021090513522068021.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/43891277219.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/sepotugixapovuximukobe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/51729423790.pdfIn PDF document text
    • https://trisyscom.com/userfiles/file/bonunidevasebetuv.pdfIn PDF document text
    • https://seikai.jp/free_images/files/nojupilevorapikate.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335cbb37d08---dexefatabixububu.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135acb4be626---ruperipixoromoxewe.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/mijuloluxesogoxubif.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/kelojega.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/vunimobesowin.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/66587592768.pdfIn PDF document text
    • http://eikenhorstgroep.nl/userfiles/file/wijezijipalanorapal.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/72953879494.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/df231be270f4ebb9044af47b0b1dff2f/37734838532.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/16584405446.pdfIn PDF document text
    • http://viorina-deko.com/images/file/60893757740.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/46253257302.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/tinaxu.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/45680873094.pdfIn PDF document text
    • http://0575zl.com/userfiles/file/27094146711.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/31736663861.pdfIn PDF document text
    • https://gangnampools.com/contents/files/51715298318.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/50693983593.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_off0000c9d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D3 17908 bytes
SHA-256: 6086e18e3af7c4be4763ef981e9bce63c23e5215a7da6f15fd2400f23e6cb263
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 11172 bytes
SHA-256: efecfa431b55a15b21629b43c5492ff85928aacf0230a85272893ee616d3937f

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