Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e5cd6f5b3de5b46…

MALICIOUS

PDF

95.8 KB Created: 2021-09-20 15:34:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09f4b8749e2b0e82cff410490c348ea8 SHA-1: 2811926e8a73db98372168ebebeed17d5db5c525 SHA-256: 7e5cd6f5b3de5b461e7472451c66472ba352a7b1149139fdfe1000b731852ee5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://krisoc.ru/uplcv?utm_term=top+free+instagram+followers+sites PDF link annotation
    • http://abnicum.ru/files/file/buguvara.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/49247500285.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/jogewu.pdfIn PDF document text
    • http://sov.tranovice.cz/webpagebuilder/ckfinder/userfiles/files/42714007650.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/59581545816.pdfIn PDF document text
    • http://santehnika34.ru/images/file/junajotozodukon.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210916045552.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/69613402812.pdfIn PDF document text
    • http://abwva.com/uploads/files/dakatuwume.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/zometefelajobefinasefaw.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/27082994643.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/pimomofe.pdfIn PDF document text
    • http://www.perlodrink.com/documents/sajirekepezagewoto.pdfIn PDF document text
    • http://riwg.in/userfiles/file/84391080717.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/37550720549.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/9082d1a75b46cee61ee84e390b84e2ff/80750606728.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf4b833c3d---vonezor.pdfIn PDF document text
    • http://apart1day.ru/file/mogevoborarozamelu.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/63313056942.pdfIn PDF document text
    • https://hanoihome.net/img_duhoc/files/patevi.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210904_2EDB77536191AA04.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/zarosorixematutotatifu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ede33f3221---26898219879.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/pumofimolinitoxokomud.pdfIn PDF document text
    • https://easyown.ddproperty.com/datas/files/bevidewoxukiwida.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_off00011069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11069 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12880 10748 bytes
SHA-256: a9926dfed12deed47946f55bbea17533c8100777e70eb46c21be83897e0a533a
font_02_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 18444 bytes
SHA-256: 902ba3590e99a637f4dfeee4083358de51c686035b642b5e438f5764ff1e31ba

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