Malicious PDF — malware analysis report

Static analysis result for SHA-256 d23c82deef1ac0fe…

MALICIOUS

PDF

87.4 KB Created: 2021-09-15 23:20:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dafc1ad14ce732ea39f45c30ddf59feb SHA-1: e1e77388da4741455d1d681e10703c851551ae08 SHA-256: d23c82deef1ac0fe9fa3d2c82b569f00375b1605d0e5bdee1052eb6fab44cb12
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://annabarons.lv/files/files/81277148646.pdf In PDF document text
    • http://nguyenxuanhuong.com/upload/files/92699753790.pdfIn PDF document text
    • http://gzmingjun.com/uploadfile/files/20210907_235057.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/67095700222.pdfIn PDF document text
    • http://maryalo.com/userData/board/file/repawodoralu.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/44197927382.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/23687982789.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6ea447fc2---57171682869.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/vokusubejusukopuso.pdfIn PDF document text
    • http://upakuika.com/img/file/xiwadafakipezix.pdfIn PDF document text
    • http://hsaltsj.com/uploads/files/gadovukasozojukesadine.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/mafal.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021091222254370554.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/54791125530.pdfIn PDF document text
    • https://anaksemut.com/contents/files/fibusajaxotitifuvo.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413eecc03a1---zunutoliju.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/36341913389.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/patudapovuwubuwebe.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142207491992---mazipamitubarifeme.pdfIn PDF document text
    • http://uniquehotelsolutions.com/files/others/3205872829.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303ed90f3e3---jemidoridimuku.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/33b15cfd6272f697958c513188e84724/tezujes.pdfIn PDF document text
    • http://bamor.org/userfiles/file/72830337966.pdfIn PDF document text
    • http://farashimirooz.com/files/12229432811.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=flutter+app+package+namePDF 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_off0000eeaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAA 18944 bytes
SHA-256: 305c156f2ba8b6b46e4b448b781f125cfebb33e300c6430b2514f7c023cd7d3d
font_01_sfnt_off0001205e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13875 10504 bytes
SHA-256: 366b0827b108be8ac1e6fe2165b55587632d09c68df8c831d2df995e786d17b0

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