Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b44a8f84f0b72d1…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 19:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f93195e47feb7638f3cdc9c272acce1 SHA-1: a881112d9bcc5c12bd078c176da8c29c403bc4c8 SHA-256: 7b44a8f84f0b72d120474bbfca91418d2c8785adb03ecee757be7c0f6596bdb4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://gartenmessebau.de/uploads/files/xozixovegepij.pdf In PDF document text
    • http://billsky.ee/files/file/ruginibos.pdfIn PDF document text
    • https://red-adlay.com/upload/files/bifiw.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/relizexo.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/42015857474.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/xezokanototimasi.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/bumifu.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/17475265630.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/vunusavate.pdfIn PDF document text
    • https://isleo.com/i_photos/file/300623807.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/774226346133dc8f4c456.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6caf780eb04bb954cba2ae6b6b82c614/kejujemag.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/94681661714.pdfIn PDF document text
    • https://maftplayer.net/calisma2/files/uploads/36286286249.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/tuwudolesojodapesesu.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/60996874487.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/jugadogalipetofifemoj.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3169d37ee---49085315882.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-9-6/20210906033650853875.pdfIn PDF document text
    • http://newshop.jp/archive/file/vovotopuro.pdfIn PDF document text
    • https://blogsma.com/files/pofagepazuxotifipufidemo.pdfIn PDF document text
    • https://ebooksweb.net/files/file/fudirofatimowiror.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a9f4a6f3b---torevok.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/67057972201.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaf7de27f4---xaxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=whether+space+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_off0000cf7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF7D 18696 bytes
SHA-256: a7004c4d6d65ed08d575c1d02f62c45654a7e38a6e1fae6eacad962cca9d721a
font_01_sfnt_off0000ffc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC3 10196 bytes
SHA-256: e8e6e49a19c214d51f3197abe368b804444ae22fb81a49955d989b6edb2292e0
font_02_sfnt_off000116de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1