Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e10fa393df71ec…

MALICIOUS

PDF

79.9 KB Created: 2021-09-11 05:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c68b334b5d295e817725c99fd46e12d1 SHA-1: 3dce8dce153f1790703c4d85d51b29311d43fa5a SHA-256: b9e10fa393df71ec707116a18682e93863f9533b25121e0e5faa5bc1d52a33d5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing lure designed to lead the user to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://srs-budapest.hu/uploads/files/tumazenulokiboti.pdf In PDF document text
    • https://www.cosanuesa.com/componentes/editor/ckfinder/userfiles/files/10631612871.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/33051607526.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/jezoxupa.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/99084492819.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/jatumepolelutupewez.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/balupojunamadow.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/87468564962.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/kogemexabejerejitaji.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/gogatikofowikerikowivo.pdfIn PDF document text
    • http://linker-apps.com/files/20491227121.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130521fad3fd---guradiderefuvipiriravaz.pdfIn PDF document text
    • http://vipdiler.ru/files/file/kiditesexupewu.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/gamuwepafuluzebeda.pdfIn PDF document text
    • http://eshop-kocicinadeje.cz/files/file/puxujesoma.pdfIn PDF document text
    • https://naves.cz/res/file/32780275438.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/lofajanekanivona.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/1nhmdd0gaeo4mk4ih7drsttt1t/tadajitabasat.pdfIn PDF document text
    • http://ityab.com/cache/fck_files/file/28228042037.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/minidugo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6514cf61b---vapeb.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/63086734419.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/87127709243.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/78432301092.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/74606330162.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/84710416215.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lr+app+download+apkPDF 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_off0000d801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD801 10032 bytes
SHA-256: 90db636dbd3d4df488000eb82f2810903daf0f0a52da6d2dd3d760330f4e1991
font_01_sfnt_off0000ee55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE55 16964 bytes
SHA-256: 58e3d037cb7e54b9aa8f7ebd2ca1d7d90c652ddc182e18bfa36c1767dd2da287
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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