Malicious PDF — malware analysis report

Static analysis result for SHA-256 7587f1e2955ebef0…

MALICIOUS

PDF

74.1 KB Created: 2021-07-17 18:07:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ce4239b449125c9cc8e1ec1b8ed69868 SHA-1: 0a4e4fee8b3fe007a78386f2e3f152f610c9f0dd SHA-256: 7587f1e2955ebef0da9e017f9feef9d8e0843f5dec9d9eb6020eeaed42f633e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics suggest the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting domains. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://qfuse.it/images/uploaded_files/ckfinder/files/1624510226_c9e06d8d38.pdf In PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ef64e047---3724478506.pdfIn PDF document text
    • http://foto-video.ch/userfiles/files/fewofizij.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/96b7ac215d4f56b64d94b1b0cf3bc455/wuzoweduvefureganofed.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/xuduwuvebepaxukekuvegokin.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd188123c9b---3358040970.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/5c3bb2930c272f83d22362c12b5f67ff/xebuniwurikulilibur.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb3275d9d1---19291741240.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7efdb59a9f---pumelusegipor.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0bb4d56d5499df88d58459a1f8c4327a/27600970431.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dc2e03075---95655340733.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vuteramuxusefupijobojufil.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e5cbba86---88332334495.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5nu2rg5tp7l68eeud4p5rqbqs1/73591376880.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6a4905788---dudexomazetijuvezowibow.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/kajoru.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/biwubinif.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5ec24aa74d---57162027064.pdfIn PDF document text
    • http://hevolta.com/upload/file/48435053585.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/40819538779.pdfIn PDF document text
    • https://newoptic.mn/uploads/files/57766770166.pdfIn PDF document text
    • http://diclenakliyat.com/userfiles/file/91403443053.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9a763b9ca---87969048434.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+office+driving+into+lakePDF 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_off0000c20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC20D 15940 bytes
SHA-256: b55ad976ca76846ee686279bbaa0e5b13502f0e646877b9f9a0eaf4a46c3753e
font_01_sfnt_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 10708 bytes
SHA-256: e4eadbca1e2ddaf0f733416d750a66d44cae2490230e51a67c7c69e76d9d4cec
font_02_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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