Malicious PDF — malware analysis report

Static analysis result for SHA-256 653bb81d17010e3b…

MALICIOUS

PDF

101.6 KB Created: 2021-07-19 07:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35021942c9edec99dcae68cdab03c31a SHA-1: e9362aa83545a1e95d8e3eb7fff54bf9cad9fa85 SHA-256: 653bb81d17010e3b9c5b6319d7b168ce0920c2535a30c159e8c9558e49a1d527
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other potentially malicious sites. The presence of these links suggests an intent to lure users to external resources for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/qib65nfjk2e69to81lh8bpl932/22982158850.pdf In PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7ba00d5a7---figufatetixuki.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621609145.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/57111677613.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945012675c6---saxugo.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/95856890068.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/mafozi.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/11411893694.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/02f9c843c5848fd273f2ea5082bdf792/xidibiretuse.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/p41h7amlkdmq1e8tvm416ac4a6/70793711600.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/pizuniburovisoji.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5cbaaa6c39---14921802340.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de64455c629---diviwexebofexafugile.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/sasitiloxujimakeg.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/5115500428.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/64glh2613b53rojp2d96sjq9i5/725514362.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/70327317232.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/33e25967d00afdfcb54e948277bf1358/48076841806.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160db3149d5a61---warerufepuwusumafudo.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/sokufivomejupex.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/18598224273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=mille+feuille+ingredientsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 25144 bytes
SHA-256: ebaed63e7a6cd319768e8c179e9626865c0a11f2badbca5fed66fa6ca64f923c
font_01_sfnt_off00012e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E36 10340 bytes
SHA-256: a4e0342e9e771d746b4ea975c74e4adebd7a4280c4a86a6b0fe516b740568064
font_02_sfnt_off0001455f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455F 3220 bytes
SHA-256: 54bca492448d9792d650d2a4c423f8125fc97f901996fa0dc96fff4a155fee33
font_03_sfnt_off00015252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A63 18108 bytes
SHA-256: a22ddc290fc7bd807493c393df34cf207ef514db1d6f395b1f0d2f9b07de2a60

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