Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19173235bf5403a…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 00:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96ff100b9ffc0b3ae467fab7720df3a4 SHA-1: 661024b5f5960dac746c607c008119de3a0a4a17 SHA-256: f19173235bf5403a5d8286c93056d91a0dcd280065d7eab3a18896719d640acf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains numerous links to other PDF files hosted on various websites, many of which appear to be compromised or disposable. The 'SE_CLICKFIX' heuristic suggests the document may also attempt to trick users into executing commands directly, a common social engineering tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO poisoning to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://oncallanatomist.org/ckfinder/userfiles/files/vatelerojuzopanesezumi.pdf In PDF document text
    • http://luchetti.it/userfiles/files/19884227013.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/4c53e9f4dc970c19edd8994ae8da1af4/6919237372.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/83348388065.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/fevitabapogatobuvukewewo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/71896128311.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/9322f2e1fd0e4da3277ef14ea649a6e3/zopatibi.pdfIn PDF document text
    • http://vgkbuilders.com/assets/files/78409417963.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/sediwaxefikuxidumabapuxub.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/09ddfbb0ed49abc8c2d330ffb17f0e6b/36229643638.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/xonumujoko.pdfIn PDF document text
    • https://noddy.nu/images/file/gigesoparemum.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/39109908535.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xenusipot.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/41f83f01104e890feb7b1c0a0dc5798b/27680564744.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/80941117053.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6684fb26a9---vusanarimubosubovu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/naredetonumimepasasuli.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7fc4e6adf---pigibaziwezipeledikut.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/lexusixosipojugu.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612996f310161---39249787362.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/66349479429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=windows+stop+code+irql_not_less_or_equal+windows+10PDF 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 18740 bytes
SHA-256: 3702d7a89c4c2615d9541bc22ac68880c08105da5f96a01ef04b02278f901e48
font_02_sfnt_off00013a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A8C 11036 bytes
SHA-256: 1ca6fb12326d307a8edc37cde6f1fed8885a98dc50f83d5d620df321853379e2

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